• English redware with marbled slip decoration, 1625-50 period or earlier, unearthed at Jamestown
    English redware with marbled slip decoration, 1625-50 period or earlier, unearthed at Jamestown
  • WordNet 3.6
    • n period a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations "in England they call a period a stop"
    • n period the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause "the women were sickly and subject to excessive menstruation","a woman does not take the gout unless her menses be stopped"--Hippocrates","the semen begins to appear in males and to be emitted at the same time of life that the catamenia begin to flow in females"--Aristotle"
    • n period an amount of time "a time period of 30 years","hastened the period of time of his recovery","Picasso's blue period"
    • n period the end or completion of something "death put a period to his endeavors","a change soon put a period to my tranquility"
    • n period a unit of geological time during which a system of rocks formed "ganoid fishes swarmed during the earlier geological periods"
    • n period (ice hockey) one of three divisions into which play is divided in hockey games
    • n period the interval taken to complete one cycle of a regularly repeating phenomenon
    • ***

Additional illustrations & photos:

Hilt and portion of blade of a swept-hilt rapier excavated at Jamestown of the 1600-1610 period Hilt and portion of blade of a swept-hilt rapier excavated at Jamestown of the 1600-1610 period
A few of thousands of clay pipe fragments unearthed at Jamestown. The ones shown range in date from 1600 to 1700. During this 100-year period, pipes developed from small bowls to fairly large ones A few of thousands of clay pipe fragments unearthed at Jamestown. The ones shown range in date from 1600 to 1700....
Light Comedy Man of the Period Light Comedy Man of the Period

Webster's Revised Unabridged Dictionary
  • Interesting fact: The Bible was written by over 40 authors over a period of 1500 years
    • Period (Mus) A complete musical sentence.
    • Period (Rhet) A complete sentence, from one full stop to another; esp., a well-proportioned, harmonious sentence. "Devolved his rounded periods .""Periods are beautiful when they are not too long."
    • Period A portion of time as limited and determined by some recurring phenomenon, as by the completion of a revolution of one of the heavenly bodies; a division of time, as a series of years, months, or days, in which something is completed, and ready to recommence and go on in the same order; as, the period of the sun, or the earth, or a comet.
    • Period A stated and recurring interval of time; more generally, an interval of time specified or left indefinite; a certain series of years, months, days, or the like; a time; a cycle; an age; an epoch; as, the period of the Roman republic. "How by art to make plants more lasting than their ordinary period ."
    • Period (Math) One of several similar sets of figures or terms usually marked by points or commas placed at regular intervals, as in numeration, in the extraction of roots, and in circulating decimals.
    • Period (Geol) One of the great divisions of geological time; as, the Tertiary period; the Glacial period . See the Chart of Geology.
    • Period (Print) The punctuation point [.] that marks the end of a complete sentence, or of an abbreviated word.
    • Period The termination or completion of a revolution, cycle, series of events, single event, or act; hence, a limit; a bound; an end; a conclusion. "So spake the archangel Michael; then paused,
      As at the world's great period ."
      "Evils which shall never end till eternity hath a period .""This is the period of my ambition."
    • Period (Med) The time of the exacerbation and remission of a disease, or of the paroxysm and intermission.
    • v. i Period To come to a period; to conclude. Obs “You may period upon this, that,” etc.
    • v. t Period To put an end to.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: Hippos drink as much as 250 litres of water in any given 24 hour period
    • n period A circuit: a round; hence, the time in which a circuit or revolution, as of a heavenly body, is made; the shortest interval of time within which any phenomenon goes through its changes of pass through them again immediately as before.
    • n period Any round of time, or series of years, days, etc. Specifically— A revolution or series of years by which time is measured; a cycle: as, the Calippic period; the Dionysian period; the Julian period.
    • n period An indefinite part of any continued state, existence, or series of events; an epoch: as, the first period of life; the last period of a king's reign; the period of the French revolution.
    • n period The point of completion of a cycle of years or round or series of events; limit; end; conclusion; termination.
    • n period Hence— The end to be attained; goal.
    • n period In rhetoric, a complete sentence from one full stop to another; a passage terminated by a full pause.
    • n period In ancient prosody, a group of two or more cola. According to the number of cola it contains, a period is dicolic, tricolic, tetracolic, etc. The end (apothesis) of a period must coincide with the end of a word, and is also characterzied by admitting of syllaba anceps and hiatus. A single colon treated thus is also regarded as a period (a monocolic period). A monocolic, dicolic, etc., period is a meter. (See meter, 1 .) Certain periods are known as lines or verses. (See line, 6 .) A group of periods is called a system.
    • n period In music, a definite and complete division of a composition, usually consisting of two or more contrasted or complementary phrases; a complete musical sentence. The term is somewhat variously used; but it always involves a cadence at the end of the period, by which it is distinctly separated from what follows. Usually a period includes eight or sixteen measures.
    • n period The point or character that marks the end of a complete sentence, or indicates an abbreviation, etc.; a full stop, thus(.).
    • n period In math.: The smallest constant difference which, added to the value of a variable, will leave that of a function (of which it is said to be the period) unchanged.
    • n period In vulgar arithmetic, one of several similar sets of figures or terms, marked by points or commas placed regularly after a certain number, as in numeration, in circulating decimals, and in the extraction of roots. Sometimes called degree.
    • n period In medicine, one of the phases or epochs which are distinguishable in the course of a disease.
    • n period Duration, continuance, term.
    • n period Bound, determination.
    • period To put an end to.
    • period To end; cease.
    • n period plural The menses.
    • n period In physical, the time of one complete oscillation or cycle of a periodic motion; the reciprocal of the frequency of a periodic motion.
    • n period In astronomy, the time of the revolution of a planet or satellite around its primary. Also orbital period.
    • n period In geology, technically, one of the larger divisions of geologic time of either the second or the third order, measured by the time of deposition of a ‘group’ or ‘system’ of formations, and characterized by the presence of a number of allied and similar faunas which as a whole differ from those of other periods. In Dana's classification the berm is applied to the third order of time-division, while the more generally adopted scheme of the International Geological Congress accords it second rank. The relation between the two a sages of this and other terms of time-nomenclature and the correlated structural and faunal equivalents is shown in the following table:
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: Humans and cows have the same gestation period, which is about nine months
    • n Period pē′ri-ud the time in which anything is performed: : :
    • v.t Period (Shak.) to put an end to
    • n Period pē′ri-ud (astron.) the time occupied by one of the heavenly bodies in making its revolution: a stated interval of time, at the end of which certain events begin again to go through the same course as before: a series of events: a series of years: length of duration: the time at which anything ends: conclusion
    • n Period pē′ri-ud (gram.) a mark at the end of a sentence
    • n Period pē′ri-ud (rhet.) a complete sentence
    • ***


  • Alfred North Whitehead
    “Periods of tranquillity are seldom prolific of creative achievement. Mankind has to be stirred up.”
  • Ambrose Bierce
    “Future: That period of time in which our affairs prosper, our friends are true and our happiness is assured.”
  • Don Marquis
    “Happiness is the interval between periods of unhappiness.”
  • Warren Buffett
    “Our favorite holding period is forever.”
  • Source Unknown
    Source Unknown
    “The average person living to age 70 has 613, 000 hours of life. This is too long a period not to have fun.”
  • Heywood Broun
    “The most prolific period of pessimism comes at twenty-one or thereabouts, when the first attempt is made to translate dreams into reality.”


Webster's Revised Unabridged Dictionary
L. periodus, Gr. a going round, a way round, a circumference, a period of time; round, about + a way: cf. F. période,
Chambers's Twentieth Century Dictionary
Fr.,—L.,—Gr. periodosperi, around, hodos, a way.


In literature:

The year 1827 was a particularly stormy period.
"A History of the English Church in New Zealand" by Henry Thomas Purchas
After this period they are transferred to the 1st reserve for 9 years, and then to the 2nd reserve.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2" by Various
Of these just about two-thirds occurred in the earlier period, while of the acquittals two-thirds belong to the later period.
"A History of Witchcraft in England from 1558 to 1718" by Wallace Notestein
If full hour periods are available, the course may be completed within one year of fifty lesson periods.
"Training the Teacher" by A. F. Schauffler
This is duly recorded by the Portuguese writers of that period.
"The Pearl of India" by Maturin M. Ballou
One historian has described the postliberation period as the "only prolonged period of peaceful development" for Bulgaria.
"Area Handbook for Bulgaria" by Eugene K. Keefe, Violeta D. Baluyut, William Giloane, Anne K. Long, James M. Moore, and Neda A. Walpole
For the earlier period the loss of Dio's work is partly supplied by the history of Zonaras, who followed him closely.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5" by Various
The period from 1878 to 1918 brought significant advances in Romania, largely in the economic and political fields.
"Area Handbook for Romania" by Eugene K. Keefe, Donald W. Bernier, Lyle E. Brenneman, William Giloane, James M. Moore, and Neda A. Walpole
Periods of Provencal Literature.
"A Short History of French Literature" by George Saintsbury
In Tate's experiments the period was never less than 40 seconds.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 3" by Various

In poetry:

Those mighty periods of years
Which seem to us so vast,
Appear no more before Thy sight
Than yesterday that's past.
"The First Six Verses Of The Ninetieth Psalm Versified" by Robert Burns
How surely stablished is Thy throne,
Which shall no change or period see!
For Thou, O Lord, and Thou alone,
Art God from all eternity.
"With glory clad, with strength arrayed," by Nahum Tate and Nicholas Brady
There once was a fellow called Croll,
Who loved to hear periods roll
On his musical tongue.
It is he who has sung,
"Ev'n sev'n heav'ns giv'n buy not my soul".
"There Once Was A Fellow Called Croll" by C J Dennis
The Past, it is pleasant! Ah, memory recalls
The period of childhood, when joyous and free,
With innocence crowned, in purity robed,
We revelled in gladness and sported in glee.
"The Past" by Mary Weston Fordham
O Sylvia, dost thou remember still
That period of thy mortal life,
When beauty so bewildering
Shone in thy laughing, glancing eyes,
As thou, so merry, yet so wise,
Youth's threshold then wast entering?
"To Sylvia" by Count Giacomo Leopardi
And what will folks say if they see you afraid?
It reflects upon me as I knew not my trade:
Courage, Friend, for to-day is your period of sorrow,
And things will go better believe me to-morrow.
Derry down, down, hey derry down.
"The Thief And Cordelier. A Ballad" by Matthew Prior

In news:

Reaching agreement with Tennessee Titans free-agent cornerback Cortland Finnegan six hours into the NFL signing period counts as being aggressive.
The most recent advance comes close to the average bull-market run of 45 weeks for that period, Leuthold found.
The greatest books on the largest empire in history were written in a seventeen-year period, from 1959 to 1976.
Public comment period ends Oct 31 on proposed 25 cents bus fare increase EVERETT.
A Perfectly Preserved Period Custom.
Microsoft reported $5.74 billion in net income, up 6 percent from the same period a year ago.
Event waiting period begins January 21 - 22, 2012.
Jewelry containing high levels of the toxic metal cadmium purchased by The Associated Press at small shops in Los Angeles during a 19-month period ending in March 2012.
Receiving was done over about a week long period, and was fun, and some long days.
"(Elk) are very sensitive during the time period that they calve ," said Laurie Smith of the Animal Services Department.
Robert Eggers' period horror pic to sell at AFM.
At the far end, the plantation's garden reflects the period's style.
LAYTON — On every other school day last year, Layton High School Senior Josh Lillywhite got to leave school for a couple of periods and spend time a block away at a residence on 234 East on Golden Avenue.
Arizona QB out for 'unspecified' period with rib cartilage damage.
Arizona QB out `unspecified' period with rib cartilage damage.

In science:

If η(x, h) is a periodic function, Eq. (2) describes a periodic system, whereas the random manifolds are characterized by a non-periodic disorder.
Universal Statistics of the Critical Depinning Force of Elastic Systems in Random Media
Fig. 1 schematizes the model: we keep h as a continuous variable and discretize the coordinate x → i; periodic boundary conditions are used so that h has period M and i has period L [24, 25].
Universal Statistics of the Critical Depinning Force of Elastic Systems in Random Media
The corresponding periodic operators differ by a periodic potential with the same periodicity lattice.
Generic sets in spaces of measures and generic singular continuous spectrum for Delone Hamiltonians
It is already shown that P (E ) = ˜Q(E ) for a dense set of periods, deg P (E ) = deg ˜Q(E ) for all periods, and coefficients of P (E ) and Q(E ) are continuous with respect to the periods.
The Heun equation and the Calogero-Moser-Sutherland system V: generalized Darboux transformations
If y is a periodic point of f with least period m, then it is a periodic point of f n with least period m/(m, n), where (m, n) is the greatest common divisor of m and n.
A Simple Proof of Sharkovsky's Theorem