• WordNet 3.6
    • adj open ready for business "the stores are open"
    • adj open not having been filled "the job is still open"
    • adj open openly straightforward and direct without reserve or secretiveness "his candid eyes","an open and trusting nature","a heart-to-heart talk"
    • adj open without undue constriction as from e.g. tenseness or inhibition "the clarity and resonance of an open tone","her natural and open response"
    • adj open affording free passage or view "a clear view","a clear path to victory","open waters","the open countryside"
    • adj open affording unobstructed entrance and exit; not shut or closed "an open door","they left the door open"
    • adj open affording free passage or access "open drains","the road is open to traffic","open ranks"
    • adj open used of mouth or eyes "keep your eyes open","his mouth slightly opened"
    • adj open having no protecting cover or enclosure "an open boat","an open fire","open sports cars"
    • adj open (set theory) of an interval that contains neither of its endpoints
    • adj open open and observable; not secret or hidden "an overt lie","overt hostility","overt intelligence gathering","open ballots"
    • adj open open to or in view of all "an open protest","an open letter to the editor"
    • adj open with no protection or shield "the exposed northeast frontier","open to the weather","an open wound"
    • adj open ready or willing to receive favorably "receptive to the proposals"
    • adj open accessible to all "open season","an open economy"
    • adj open not sealed or having been unsealed "the letter was already open","the opened package lay on the table"
    • adj open not brought to a conclusion; subject to further thought "an open question","our position on this bill is still undecided","our lawsuit is still undetermined"
    • adj open (of textures) full of small openings or gaps "an open texture","a loose weave"
    • adj open possibly accepting or permitting "a passage capable of misinterpretation","open to interpretation","an issue open to question","the time is fixed by the director and players and therefore subject to much variation"
    • adj open not requiring union membership "an open shop employs nonunion workers"
    • adj open not defended or capable of being defended "an open city","open to attack"
    • v open make available "This opens up new possibilities"
    • v open become available "an opportunity opened up"
    • v open make the opening move "Kasparov opened with a standard opening"
    • v open cause to open or to become open "Mary opened the car door"
    • v open become open "The door opened"
    • v open spread out or open from a closed or folded state "open the map","spread your arms"
    • v open display the contents of a file or start an application as on a computer
    • v open afford access to "the door opens to the patio","The French doors give onto a terrace"
    • v open begin or set in action, of meetings, speeches, recitals, etc. "He opened the meeting with a long speech"
    • v open start to operate or function or cause to start operating or functioning "open a business"
    • v open have an opening or passage or outlet "The bedrooms open into the hall"
    • n open information that has become public "all the reports were out in the open","the facts had been brought to the surface"
    • n open a tournament in which both professionals and amateurs may play
    • n open where the air is unconfined "he wanted to get outdoors a little","the concert was held in the open air","camping in the open"
    • n open a clear or unobstructed space or expanse of land or water "finally broke out of the forest into the open"
    • ***

Additional illustrations & photos:

Have to Remain There Until Spring Opened 183 Have to Remain There Until Spring Opened 183
N nodded at it. O opened it. P peeped at it N nodded at it. O opened it. P peeped at it
man opening yard gate onto wolfhound man opening yard gate onto wolfhound
The wolf pulled the bobbin and opened the door The wolf pulled the bobbin and opened the door
Just then the door opened Just then the door opened
The gates opened from within The gates opened from within
Then the door slowly opened Then the door slowly opened

Webster's Revised Unabridged Dictionary
  • Interesting fact: Disneyland opened in 1955.
    • Open Free of access; not shut up; not closed; affording unobstructed ingress or egress; not impeding or preventing passage; not locked up or covered over; -- applied to passageways; as, an open door, window, road, etc.; also, to inclosed structures or objects; as, open houses, boxes, baskets, bottles, etc.; also, to means of communication or approach by water or land; as, an open harbor or roadstead. "Through the gate,
      Wide open and unguarded, Satan passed."
    • Open Free or cleared of obstruction to progress or to view; accessible; as, an open tract; the open sea.
    • Open Free to be used, enjoyed, visited, or the like; not private; public; unrestricted in use; as, an open library, museum, court, or other assembly; liable to the approach, trespass, or attack of any one; unprotected; exposed. "If Demetrius . . . have a matter against any man, the law is open and there are deputies.""The service that I truly did his life,
      Hath left me open to all injuries."
    • Open Free; disengaged; unappropriated; as, to keep a day open for any purpose; to be open for an engagement.
    • Open (Mus) Not closed or stopped with the finger; -- said of the string of an instrument, as of a violin, when it is allowed to vibrate throughout its whole length.
    • Open Not concealed or secret; not hidden or disguised; exposed to view or to knowledge; revealed; apparent; as, open schemes or plans; open shame or guilt; open source code.
    • Open Not drawn together, closed, or contracted; extended; expanded; as, an open hand; open arms; an open flower; an open prospect. "Each, with open arms, embraced her chosen knight."
    • Open Not of a quality to prevent communication, as by closing water ways, blocking roads, etc.; hence, not frosty or inclement; mild; -- used of the weather or the climate; as, an open season; an open winter.
    • Open Not settled or adjusted; not decided or determined; not closed or withdrawn from consideration; as, an open account; an open question; to keep an offer or opportunity open.
    • n Open Open or unobstructed space; clear land, without trees or obstructions; open ocean; open water. "To sail into the open .""Then we got into the open ."
    • Open (Mus) Produced by an open string; as, an open tone.
    • Open (Sporting) To bark on scent or view of the game.
    • Open To begin; to commence; as, the stock opened at par; the battery opened upon the enemy.
    • Open To disclose; to reveal; to interpret; to explain. "The king opened himself to some of his council, that he was sorry for the earl's death.""Unto thee have I opened my cause.""While he opened to us the Scriptures."
    • Open To enter upon; to begin; as, to open a discussion; to open fire upon an enemy; to open trade, or correspondence; to open an investigation; to open a case in court, or a meeting.
    • Open To expand; to spread out; to be disclosed; as, the harbor opened to our view.
    • Open To loosen or make less compact; as, to open matted cotton by separating the fibers. "Poetry that had opened up so many delightful views into the character and condition of our “bold peasantry, their country's pride.”"
    • Open To make known; to discover; also, to render available or accessible for settlements, trade, etc. "The English did adventure far for to open the North parts of America."
    • Open To make or set open; to render free of access; to unclose; to unbar; to unlock; to remove any fastening or covering from; as, to open a door; to open a box; to open a room; to open a letter. "And all the windows of my heart
      I open to the day."
    • Open To spread; to expand; as, to open the hand.
    • Open To unclose; to form a hole, breach, or gap; to be unclosed; to be parted. "The earth opened and swallowed up Dathan, and covered the company of Abiram."
    • Open (Phon) Uttered with a relatively wide opening of the articulating organs; -- said of vowels; as, the än fär is open as compared with the ā in sāy.
    • Open (Phon) Uttered, as a consonant, with the oral passage simply narrowed without closure, as in uttering s.
    • Open Without reserve or false pretense; sincere; characterized by sincerity; unfeigned; frank; also, generous; liberal; bounteous; -- applied to personal appearance, or character, and to the expression of thought and feeling, etc.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: More people are afraid of open spaces (kenophobia) than of tight spaces (claustrophobia).
    • open Unclosed, literally or figuratively; not shut or closed; hence, affording access, or free ingress and egress: as, an open door.
    • open Unstopped: as, an open bottle.
    • open Unsealed: as, an open letter.
    • open Uncovered: as, an open jar; an open drain.
    • open Without deck: as, an open boat.
    • open Without protecting barrier of any kind: as, an open harbor or roadstead; an open gallery.
    • open Exposed; liable; subject.
    • open Free from or without physical hindrance or impediment; clear; hence, free of access; affording free passage; as, the river is now open for navigation.
    • open Unfilled; unoccupied: as, the appointment is still open.
    • open Undecided; unsettled or undetermined: as, an open question.
    • open Not yet balanced or adjusted; not yet closed or wound up; subject to further additions: as, an open account or policy.
    • open At liberty; free; as yet disengaged; not preoccupied or prepossessed; not forestalled; available: as, an open day; open to engagements.
    • open Presenting no moral or logical hindrance or difficulty; morally or logically possible.
    • open Unrestricted; public; free to be used or enjoyed by all: as, open market; open competition.
    • open Uninclosed; not inclosed or surrounded by barriers; accessible on all or nearly all sides; affording free ingress or access on all sides or on more sides than one: as, the open country; an open space; the open sea.
    • open Hence — Not shut off or obstructed; unobstructed; free; clear: as, the open air; an open view; open day.
    • open Not obstructed by ice or frost; clear of ice: as, open water in the polar seas; hence, as applied to weather or the seasons, not marked by ice and snow; mild; moderate: as, open weather.
    • open Not drawn, folded, or rolled together; unclosed; unfolded; expanded; spread out; parted; apart: as, an open hand; an open flower; in open order.
    • open Hence Free in giving or communicating; liberal; generous; bounteous.
    • open Containing apertures; perforated; of a loose texture: as, open work.
    • open Not concealed; plain in the sight of all; exposed to view: as, open shame.
    • open Free from concealment, dissimulation, reserve, or disguise; not secret or secretive; plain and aboveboard; candid; frank; free-spoken; ingenuous: as, an open face; an open avowal; an open enemy; open defiance.
    • open Ready (to hear, do, see, or receive anything); attentive; receptive; amenable, as to reason, advice, influence, pity, etc.
    • open In music. See open diapason, open harmony, open string, etc., under the nouns.
    • open Uttered with an unclosed or a less closed position of the mouth-organs: as, a sibilant is a more open sound than a mute; a vowel is more open than a consonant; open and close e.
    • open Not closed by a consonant: said of a vowel, or a syllable ending in a vowel, upon which another vowel follows.
    • open In electricity, not forming a part of a closed circuit; not connected with other wires or with the earth so as to form a complete electric circuit.
    • open In chemical and other industries, a term applied to steam admitted directly into a tank or vessel, and acting directly upon substances to be treated, as fabrics or yarns in dyeing, or materials in soap-making. Also called wet-steam, because as soon as admitted it begins to condense, and thus always holds in suspension a considerable percentage of water.
    • open A badge or ornament resembling a coronet set upon the left shoulder or planted on the left breast of English effigies of the fifteenth and sixteenth centuries. It is thought to have been the indication of some rank or office, as that of yeoman of the crown, but this has not been verified.
    • open To be very hospitable; entertain many friends.
    • open Synonyms and Uncovered, unprotected, exposed, obvious, public. Frank, Ingenuous, etc. (see candid), unreserved, undissembling, artless, guileless.
    • n open An open or clear space.
    • n open The open air.
    • open To make open; cause to be open; unlock, unfasten, or draw apart or aside, and thus afford access or egress, or a view of the interior parts; make accessible or visible by removing or putting or pushing aside whatever blocks the way or the view; unclose.
    • open To form by cutting, cleaving, removing, or pushing aside whatever impedes or hinders: as, to open a way, road, or path through the woods; to open a hole or breach in the enemy's walls.
    • open To pierce or cut into, and lay bare or make accessible: as, to open an animal; to open a wound.
    • open To spread out; expand; unclose; unroll; unfold; extend: as, to open one's hand, a book, or a fan; to open ranks.
    • open To lay bare; expose; exhibit; reveal; disclose: as, to open one's mind freely to a friend; to open one's grief or one's plans.
    • open To unfold; expound; explain; interpret: as, to open a text.
    • open To expand or enlighten; enlarge; make receptive; render accessible to wisdom, knowledge, enlightenment, improvement, or new influences.
    • open To render accessible or available for settlement, use, intercourse, etc.: as, to open land; to open a country to trade: sometimes with up: as, to open up trade.
    • open To discover; come into view of.
    • open To set in action; start; initiate; commence: as, to open a public assembly, a session of Congress, or Parliament; to open an exhibition; to open a shop; to open a correspondence, a discussion, a negotiation, proceedings, etc.
    • open To shuck or shell; remove the shell or husk from the meat or the fruit of, as an oyster; cut out.
    • open In law: To state (the case) to the court or jury, preliminary to adducing evidence; more specifically, to make the first statement for this purpose, and give evidence under it, before the adversary is allowed to do so.
    • open To recall or revoke, as a judgment or decree, for the purpose of allowing further contest or delay.
    • open In malting, to shovel up the edges and throw a portion of (the couched grain) toward the center of the couch, distributing it in such a manner as to leave a somewhat greater depth of grain at the edges than at the center of the couch. See malting and couch, 5.
    • open Specifically, to loosen the consistency or texture of; give a freer or less dense consistency or texture to.
    • open Synonyms To uncover.
    • open To exhibit, make manifest.
    • open To unclose; be opened or become open.
    • open To afford access, entrance, egress, or view: as, a gate opened on the lane.
    • open To burst open; become parted, ruptured, or broken; gape.
    • open To burst and unfold; spread out or expand, as a bud or flower.
    • open To become expanded or enlightened; become receptive or ready to receive.
    • open To begin; commence: as, sales opened at par; the exhibition opened yesterday; the story opens well. Often used elliptically, an object being understood: as, we opened on the enemy at once (that is, opened fire, or began the attack at once); he opened on him with vigor (that is, began to attack him with vigor).
    • open To begin to appear; become more distinct; expand before the eye on nearer approach or favorable change of position; become more visible or plain as position changes: as, the harbor opened to our view.
    • open In hunting, to begin to bark on view or scent of the game.
    • open To yield or make (a certain quantity) when opened: said of oysters: as, to open well or badly; to open (at the rate of) six quarts per bushel.
    • open Openly.
    • open In printing, said of a composition in type that is wide-leaded or with excess of quadrats or other blanking-out material, known to compositors as ‘fat matter.’
    • n open An opening; a hole; the widening of a river at its mouth: as, the open of Humber; a gap in sand-dunes through which a road can pass.
    • n open An opportunity; an opening; a chance.
    • open Nautical, to appear to separate and become distinct, as lights in a harbor when the vessel nears.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: On this planet there is a can of SPAM opened every four seconds.
    • adj Open ō′pn not shut: allowing one to pass out or in: free from trees: not fenced: not drawn together: spread out: not frozen up: not frosty: free to be used, &c.: public: without reserve: frank: easily understood: generous: liberal: clear: unbalanced, as an account: attentive: free to be discussed
    • v.t Open to make open: to remove hinderances: to bring to view: to explain: to begin
    • v.i Open to become open: to unclose: to be unclosed: to begin to appear: to begin
    • n Open a clear space
    • adj Open open-cast, of mining work in open air
    • ***


  • Chinese Proverb
    Chinese Proverb
    “Teachers open the door but you must walk through it yourself.”
  • Chinese Proverb
    Chinese Proverb
    “Don't open a shop unless you like to smile.”
  • Jules Renard
    “Don't tell a woman she's pretty; tell her there's no other woman like her, and all roads will open to you.”
  • Napoleon Bonaparte
    “Let the path be open to talent.”
  • Thomas Fuller
    “He that bringeth a present findeth the door open.”
  • Florence Scovel Shinn
    Florence Scovel Shinn
    “Giving opens the way for receiving.”


Eye-opener - Something surprising, unexpected which reveals the truth about something or someone.
Keep your options open - If someone's keeping their options open, they aren't going to restrict themselves or rule out any possible course of action.
Open all hours - If a shop or suchlike is open all hours, it only closes, if at all, terribly late.
Open book - If a person is an open book, it is easy to know what they think or how they feel about things.
Open old sores - When a sore is almost healed, and if a person rips or tears it open, it is way of preventing the healing process and further aggravating the pain. This phrase, metaphorically suggests, to revive or reopen a quarrel or enmity which was almost forgotten.
Open old wounds - If you open old wounds, you revive a quarrel or problem that caused a lot of trouble in the past.
Open secret - An open secret is something that is supposed to be secret but is common knowledge.
Open-and-shut - A question or issue that is open-and-shut is easily proved or settled.
Opening a can of worms - If you open a can of worms, you do something that will cause a lot of problems and is, on balance, probably going to cause more trouble than it's worth.
Pushing at an open door - If you're pushing at an open door, you achieve what you want easily because many people agree with you or support you.


Webster's Revised Unabridged Dictionary
AS. open,; akin to D. open, OS. opan, G. offan, Icel. opinn, Sw. öppen, Dan. aaben, and perh. to E. up,. Cf. Up, and Ope


In literature:

The outer door was flung open, and Greta entered, flushed and with wide-open eyes.
"A Son of Hagar" by Sir Hall Caine
The other Arabs leaped through the open windows and, mounting their horses, fled across the desert.
"The Son of Monte Christo" by Jules Lermina
Eustace took the telegram mechanically, opened and read it and handed it, open, to Harding.
"The Rider of Waroona" by Firth Scott
Juliette, open, open, stupid.
"Hurricane Island" by H. B. Marriott Watson
A servant leapt to fling open the door for Manfred, who strode briskly toward it, tossing pleasantries to his courtiers.
"The Saracen: Land of the Infidel" by Robert Shea
When he had opened the door, the strange woman stood on the threshold.
"The Rainbow" by D. H. (David Herbert) Lawrence
She had been singing, then she closed her eyes, and a moment later when she opened them again, White Bear had opened his.
"Shaman" by Robert Shea
Found in open woods, or along paths in open woods or pastures.
"The Mushroom, Edible and Otherwise" by M. E. Hard
Athabasca Landing was still the door that opened and closed on the great North.
"The Valley of Silent Men" by James Oliver Curwood
The door stood open; the window stood open.
"The Hound From The North" by Ridgwell Cullum

In poetry:

Show thy vacant tomb, and let,
As of old, the angels sit,
Whispering, by its open door
"Fear not! He hath gone before!"
"My Dream" by John Greenleaf Whittier
The first place that he came unto
It was the open wold,
And underneath were prickly whins,
And a wind that blew so cold.
"The Ballad Of Judas Iscariot" by Robert Williams Buchanan
Peace! that name is his! Speak it again—I rave.
He thought I loved him—and I did—I do.
Open the door, my lord!
"Within and Without: Part IV: A Dramatic Poem" by George MacDonald
So he open'd his prophet bosom,
As he stood by the stream alone,
And a song burst from the poet,
And the world made it its own.
"Give Me A Song, Thou Poet" by Alexander Anderson
Open water, open water!
Fiery sun and cooling shower
Quicken earth to speak with power.
Soul responds, the wonder viewing:
Strength is here for life's renewing.
"Open Water!" by Bjornstjerne Bjornson
St. Peter he opened, and so we entered in,
Into the holy seat secure, which is all free from sin;
St. Peter he opened, and so we entered there,
And the glory of the temple no man can compare.
"The Masonic Hymn" by Anonymous British

In news:

SAINT JOHN , New Brunswick — Regional powerhouse Lounsbury Furniture has opened its first ever store here, the fifth in the chain and the first it has opened in many years.
SAINT JOHN, New Brunswick — Regional powerhouse Lounsbury Furniture has opened its first ever store here, the fifth in the chain and the first it has opened in many years.
Restaurant openings Sardinia , a Restaurant and Wine Bar in Miami Beach, Will Open a Nashville Location.
APPETITE Not since State Bird Provisions and AQ opened towards the end of 2011 have I been as excited about an opening.
Osaka, Japan – Second-seeded Zheng Jie of China was among the winners Tuesday in the first round at the HP Open, while former French Open champ Francesca Schiavone retired during her opening match.
Wild Mountain in Taylor's Falls opened one and a half runs and two rope tows Sunday, more than two weeks before its previous earliest opening date.
DLA Piper partner opens his new shop, and white-collar criminal defender Preston Burton co-opens a new firm.
The resort opened for just four hours for a one-day fundraiser that marked the earliest Squaw Valley has opened to the public since it started keeping records in 1960.
Open minds lead to open doors.
The Associated Press Australian Open champion Serena Williams withdrew from the Open GDF Suez .
Dustin Snipes/Courtesy of US Sumo Open Natasha Ikejiri, left, the women's open-weight national champion, battles Natalie Burns during the 2011 US Sumo Open National Championship in Las Vegas.
New Sunspot map highlights Oklahoma open records, open meetings complaints.
It's Open Season on Verizon Open Internet Arguments.
Widlund Gallery, Tannery Pond Community Center 228 Main Street, North Creek, NY 518-251-2421 Open: Mon-Sat 9 am-4 pm, Sun whenever the "Open" flag is out.
Only a month after opening a Tutti Futti frozen yogurt shop in Palm City, partners Mitch Grossman, Jeff Arrigoni and Luke Verdegem are ready to open a second shop in Port St Lucie.

In science:

In this section, we will consider multiparticle tree scattering amplitudes consisting of the external states of N − 2 vectors obtained from the mode of the p′ -p′ open string and two tachyons from the mode of the p-p′ open string.
Worldsheet and Spacetime Properties of p-p' System with B Field and Noncommutative Geometry
But, f (U ) ∩ W0 is open in W , hence in W0 as well and thus (by the openness of W0 in Y ) in Y , too.
On the Gribov Problem for Generalized Connections
FIG. 10: The transition temperature Ttrans as a function of the length of the blocks L as found in MC simulations (open square, left ordinate) and in SCF calculations (open circles, right ordinate).
Coil-Globule Transition for Regular, Random and Specially Designed Copolymers: Monte Carlo Simulation and Self-Consistent Field Theory
For ω ∈ Ω, let η(ω ) = {e ∈ E : ω (e) = 1} denote the set of open edges, and let k(ω ) be the number of connected components (or ‘open clusters’) of the graph (V , η(ω )).
The Random-Cluster Model
Roughly speaking it means that instead of open strings, as in fig. 9, the interaction is effectively performed by ”open membranes”.
String Theory or Field Theory?