• 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
    • adj periodic recurring or reappearing from time to time "periodic feelings of anxiety"
    • adj periodic happening or recurring at regular intervals "the periodic appearance of the seventeen-year locust"
    • ***

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
    • Periodic Happening, by revolution, at a stated time; returning regularly, after a certain period of time; acting, happening, or appearing, at fixed intervals; recurring; as, periodical epidemics. "The periodic return of a plant's flowering.""To influence opinion through the periodical press."
    • Periodic Of or pertaining to a period or periods, or to division by periods. "The periodical times of all the satellites."
    • Periodic (Rhet) Of or pertaining to a period; constituting a complete sentence.
    • Periodic Performed in a period, or regular revolution; proceeding in a series of successive circuits; as, the periodical motion of the planets round the sun.
    • a Periodic (Chem) Pertaining to, derived from, or designating, the highest oxygen acid of iodine.
    • ***
Century Dictionary and Cyclopedia
  • Interesting fact: Hippos drink as much as 250 litres of water in any given 24 hour period
    • periodic Pertaining to or of the nature of a period, cycle, or round of years or events.
    • periodic Performed or proceeding in a series of successive circuits or revolutions: as, the periodic motions of the planets round the sun, or of the moon round the earth.
    • periodic Happening or occurring at regularly recurring intervals of time; statedly recurring; as, a periodic publication; the periodic return of a plant's flowering; periodic outbursts; the periodic character of ague; the periodic motion of a vibrating tuniug-fork or musical string.
    • periodic In rhetoric: Of or pertaining to a period or complete sentence; complete in grammatical structure.
    • periodic Noting that form of sentence in which the sense is incomplete or suspended until the end is reached.
    • periodic In mathematics, with values which recur as the value of the independent variable continuously increases.
    • periodic Noting an acid, a substance produced by the interaction of iodine and aqueous perchloric acid, known only in crystals which contain two molecules of water: HIO4.2H2O. Its solution has a strong acid reaction and it forms several distinct series of salts.
    • ***
Chambers's Twentieth Century Dictionary
  • Interesting fact: Humans and cows have the same gestation period, which is about nine months
    • adjs Periodic pertaining to a period: happening by revolution: occurring at regular intervals: pertaining to periodicals
    • ***


  • Don Marquis
    “Happiness is the interval between periods of unhappiness.”
  • Warren Buffett
    “Our favorite holding period is forever.”
  • Princess of Wales Diana
    “The kindness and affection from the public have carried me through some of the most difficult periods, and always your love and affection have eased the journey.”
  • 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.”
  • Hermann Broch
    Hermann Broch
    “The world has always gone through periods of madness so as to advance a bit on the road to reason.”
  • Thomas B. Macaulay
    “We know no spectacle so ridiculous as the British public in one of its periodical fits of morality.”


Webster's Revised Unabridged Dictionary
L. periodicus, Gr. : cf. F. périodique,
Chambers's Twentieth Century Dictionary
Fr.,—L.,—Gr. periodosperi, around, hodos, a way.


In literature:

Influence of Vibrating Period and Molecular Form.
"Fragments of science, V. 1-2" by John Tyndall
This class of comets may be divided into two kinds, which are known as Short Period Comets and Long Period Comets respectively.
"Aether and Gravitation" by William George Hooper
At one period five knightly branches of the house flourished simultaneously in the county.
"Sir Walter Ralegh" by William Stebbing
At this period the various forms seem to be more varied and less arranged according to some rule.
"A History of Art for Beginners and Students" by Clara Erskine Clement
Different periods of manufacture and the peculiarities of.
"Scarabs" by Isaac Myer
The assumption of their periodicity cannot, as yet, be considered as confirmed.
"The Sailor's Word-Book" by William Henry Smyth
The period of reaction had gone, and the period of action was come again.
"Great Men and Famous Women. Vol. 4 of 8" by Various
But about this, if God permit, I will say more when I come to that period of my life.
"The Life of Trust: Being a Narrative of the Lord's Dealings With George Müller" by George Müller
It happens that the periodic time of Venus bears a remarkable relation to the periodic time of the earth.
"The Story of the Heavens" by Robert Stawell Ball
Since the years 1866-1871 no period of Austro-Hungarian development has been so important as the years 1903-1907.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1" by Various
Not one of the six banks which had the privilege of issue at that period has lost it since.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 3" by Various
It was, however, only at a late period that this conception was carried far enough to make the separation effective.
"Introduction to the History of Religions" by Crawford Howell Toy
The periodicals and special articles alluded to in this chapter constitute the best sources as yet available for the period.
"The New Nation" by Frederic L. Paxson
Three periods into which their education was divided.
"History of Education" by Levi Seeley
Her writings were the inspiration of Harriet Martineau, who followed her in the same department of thought at a later period.
"History of Woman Suffrage, Volume I"
At the Revolutionary period the principles of unbelief were diffused to a considerable extent throughout the colonies.
"The Loyalists of Massachusetts" by James H. Stark
Two sets of teeth regularly appear, at different periods of life; one in infancy, and the other, at a later period.
"Popular Technology, Vol. I (of 2)" by Edward Hazen
During certain periods of the Tertiary epoch it is true that there was more similarity between Europe and North America than there is at present.
"The Cambridge Natural History, Vol X., Mammalia" by Frank Evers Beddard
There is no inscription to record by whom and at what period this passage was cut.
"Discoveries among the Ruins of Nineveh and Babylon" by Austen H. Layard
The inscriptions are mostly dated, and belong to the period between 9 B.C.
"Encyclopaedia Britannica, 11th Edition, Volume 14, Slice 6" by Various

In poetry:

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
Nor did th' Almighty raise the sky,
Nor hand th' eternal lamps on high
On one abode to shine;
The circle of a thousand suns
Extends, while nature's period runs
The theatre divine.
"Ode to a Man of Letters" by John Logan
Chorus of Jews.
What ail'd thee, that thou stood'st still,
O Sun! nor did thy flaming orb decline?
And thou, O Moon? in Ajalon's low vale,
Why didst thou long before thy period shine?
"Belshazzar. A Sacred Drama" by Hannah More
They heard him cry in a deep and tender voice
(With the crackling torch for chorus and period)
That made the pale, ecstatical moon rejoice)
"I am he, that rebellious one who will be God!
"Crimen Amoris" by Clark Ashton Smith
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
It is not well to hate him for the pain
He brought you, and the sorrows manifold.
To pardon him these hurts still I am fain;
For in the panting period of his reign,
He brought me new wounds, but he healed the old.
"The King Is Dead" by Paul Laurence Dunbar

In news:

In the period immediately following the end of World War II, American theater was transformed by the work of playwright Arthur Miller .
Lent period begins on Wednesday.
Ashland's Charity Collins and Russell's Kodie Patrick during the second period of the 63rd District championship.
A furious second-period rally to tie the score wasn't enough for the Evansville IceMen on Friday night.
MRC period crime thriller would shoot in 2013.
Mullens said he wants to use the pickup games, which consist of three 20-minute periods, to work on his ball -handling and perimeter shooting.
He left Cuba to start anew in Louisville, KY only three years ago and in that time period he has been very busy here filling several galleries and museums with his work.
The fourth quarter is always an active – and critical – period for retailers, but with just six weeks left and still much left unresolved, the second-half has much more on the line.
Voit Real Estate Services closed 3 new deals in a three-month period.
I like Breathless enormously—for a certain period I was ashamed of it, but now I place it where it belongs—with Alice in Wonderland.
After years of quarrels with the city of Paris and a two-year construction period, H&M finally opened its doors on the world famous and said-to be most beautiful avenue, les Champs Elysées .
Her recent travels took her to the West and Midwest over a three-week period.
The Nazis conjured up the period extravaganza Kolberg.
Two or three 45-minute class periods.
New Armagh manager Paul Grimley has hailed the arrival of a new sponsor on board for what he views as "an exciting transitional period" for his county.

In science:

Since there are only finitely many rotor configurations, the sequence of vertices ((xt , rt ))t≥0 is eventually periodic (with explicit upper bounds on the period and the time taken to become periodic which are exponentially large in the number of vertices).
Rotor Walks and Markov Chains
Our analysis reveals two low-amplitude (∼ 0.02 mag) periodic signals, one attributable to the rotation of the primary with a period of 3.293 ± 0.001 d and the other to the rotation of the secondary with a period of 14.05 ± 0.05 d.
Near-Infrared Light Curves of the Brown Dwarf Eclipsing Binary 2MASS J05352184-0546085: Can Spots Explain the Temperature Reversal?
For example, Selvelli et al. (2008) recognized a low probability that the true orbital period is the spectroscopic period of 3.439 hours reported by Vogt et al. (1990), but even with this period, the observed ˙M is much too large.
The Nova Shell and Evolution of the Recurrent Nova T Pyxidis
To avoid a conical singularity at the origin, it is necessary that θ is periodic with period 2π , which — in turn — requires tE to be periodic with period 2π/κ.
Thermodynamical Aspects of Gravity: New insights
The original aim of this monitoring was to detect evolutionary period changes, but the periodic variation that was found is more likely to be caused by an orbiting planet inducing period variations through the light travel time effect.
A survey for pulsating subdwarf B stars with the Nordic Optical Telescope
Periods of high temperature are alternated with periods of low temperature (in a periodic manner), this way the regions around the local maximum and the global parameter space are explored in turn.
The search for spinning black hole binaries in mock LISA data using a genetic algorithm
The periodic points are typically located in between the regions occupied by the patch for short residence times, which cannot contain periodic points as they are filled with new fluid at each period.
Measures of mixing quality in open flows with chaotic advection
This is better than returning w (k) + x(k) mod 2w (as was done in an earlier version of xorgens) because the least significant bit of w (k) has period 2, but all bits of w (k)(I ⊕Rγ ) have a longer period (about 2w/2), and this period is relatively prime to the period 2n − 1 of x(k) .
Some long-period random number generators using shifts and xors
Barnes 2007), for short-period binaries, where tidal locking is almost certain, the rotation periods offer true orbital periods instead.
Thirty New Low-Mass Spectroscopic Binaries
Let x be a periodic sequence with period p, and y be a periodic sequence with period q .
Random subshifts of finite type
Further, the number of periodic orbits of each period in XGn is constant, and the probability of each periodic orbit being allowed in Xω is constant.
Random subshifts of finite type
We have shown that the probability that there is no periodic orbit of period z1 tends to 0 exponentially in m as n tends to infinity, and the probability that there exists no periodic orbit of period z2 tends to 0 exponentially in m as n tends to infinity.
Random subshifts of finite type
FIG. 2: (Color online) Schematic roughness diagram at the depinning transition of a random-periodic system with periodicity M and localized periodic correlation peaks as a function of its steady-state velocity v .
Random-Manifold to Random-Periodic Depinning of an Elastic Interface
Then, when comparing the periodic disorder case to the periodic chain, the period of the disorder potential M becomes the average distance between neighboring particles.
Random-Manifold to Random-Periodic Depinning of an Elastic Interface
Because Φ is equivariant and Λ is a restriction map, Λ−1Φ takes periodic measures to periodic measures (where a measure λ ∈ MG(ΩG ) is periodic if it has finite support).
Random walks on random coset spaces with applications to Furstenberg entropy