epoch

Definitions

  • WordNet 3.6
    • n epoch a unit of geological time that is a subdivision of a period and is itself divided into ages
    • n epoch a period marked by distinctive character or reckoned from a fixed point or event
    • n epoch (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
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Webster's Revised Unabridged Dictionary
    • Epoch (Geol) A division of time characterized by the prevalence of similar conditions of the earth; commonly a minor division or part of a period. "The long geological epoch which stored up the vast coal measures."
    • Epoch A fixed point of time, established in history by the occurrence of some grand or remarkable event; a point of time marked by an event of great subsequent influence; as, the epoch of the creation; the birth of Christ was the epoch which gave rise to the Christian era. "In divers ages, . . . divers epochs of time were used.""Great epochs and crises in the kingdom of God.""The acquittal of the bishops was not the only event which makes the 30th of June, 1688, a great epoch in history."
    • Epoch A period of time, longer or shorter, remarkable for events of great subsequent influence; a memorable period; as, the epoch of maritime discovery, or of the Reformation. "So vast an epoch of time.""The influence of Chaucer continued to live even during the dreary interval which separates from one another two important epochs of our literary history."
    • Epoch (Astron) An arbitrary fixed date, for which the elements used in computing the place of a planet, or other heavenly body, at any other date, are given; as, the epoch of Mars; lunar elements for the epoch March 1st, 1860.
    • Epoch (Astron) The date at which a planet or comet has a longitude or position.
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Century Dictionary and Cyclopedia
    • n epoch A point of time from which succeeding years are numbered; especially, a point of time distinguished by some remarkable event, or the event itself as distinguishing the time of its occurrence.
    • n epoch Hence A specific period of time; any space of time considered as a unit with reference to some particular characteristic or course of events.
    • n epoch In geology, specifically, one of the shorter divisions of geological time. This word is used differently by different geological writers. Thus, Jukes divides the entire series of fossiliferous strata into only three epochs, while Dana makes eight out of the Lower Silurian alone. Some later writers avoid the use of such words as epoch and age, saying, for instance, instead of Silurian epoch or age, simply Silurian.
    • n epoch In astronomy, an arbitrary fixed date, for which the elements of a planetary or cometary orbit, or of any motion, are given.
    • n epoch See the adjectives.
    • n epoch See equivalent phrases under era.
    • n epoch Synonyms Epoch, Era, Period, Age. Epoch and era should be distinguished, though in common usage they are interchanged. “An era is a succession of time: an epoch is a point of time. An era commonly begins at an epoch. We live in the Christian era, in the Protestant era, in the era of liberty and letters. The date of the birth of Christ was an epoch: the period of the dawn of the Reformation was an epoch” (A. Phelps, Eng. Style, p. 365). Period may be the opposite of epoch, in being the date at which anything ends, or it may be mere duration, or duration from point to point; the word is very free and often indefinite in its range of meaning. The meaning of age is modified by its connection with human life, so as often to be associated with a person: as, the age of Pericles; but it is also freely applied to time, viewed as a period of some length: as, the bronze age; the golden age; this is an age of investigation.
    • n epoch In the mechanics of vibration, a term introduced into the equation for a simple harmonic motion in cases where time is not reckoned from the instant when the vibrating particle has reached its greatest positive elongation. The equation then becomes x = α cos (tω + e), in which e is the epoch. The epoch is the angle traversed by the point of reference in the interval between the era of reckoning and the instant of greatest elongation.
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Chambers's Twentieth Century Dictionary
    • n Epoch ep′ok a point of time fixed or made remarkable by some great event from which dates are reckoned: a period remarkable for important events:
    • n Epoch ep′ok (astron.) the mean heliocentric longitude of a planet in its orbit at any given time
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Quotations

  • Friedrich Nietzsche
    Friedrich%20Nietzsche
    “Insanity in individuals is something rare -- but in groups, parties, nations, and epochs it is the rule.”
  • Le Corbusier
    Le Corbusier
    “Our own epoch is determining, day by day, its own style. Our eyes, unhappily, are unable yet to discern it.”
  • Robert Louis Stevenson
    Robert%20Louis%20Stevenson
    “The obscurest epoch is to-day.”

Etymology

Webster's Revised Unabridged Dictionary
LL. epocha, Gr. 'epochh` check, stop, an epoch of a star, an historical epoch, fr. 'epe`chein to hold on, check; 'epi` upon + 'e`chein to have, hold; akin to Skr. sah, to overpower, Goth. sigis, victory, AS. sigor, sige, G. sieg,: cf. F. époque,. See Scheme
Chambers's Twentieth Century Dictionary
Gr. epochēepechein, to stop—epi, upon, echein, to hold.

Usage

In literature:

The actual epoch is a hundred thousand, at least.
"Bouvard and Pécuchet" by Gustave Flaubert
It is impossible to determine the exact epoch of this primitive celestial geography.
"Astronomy for Amateurs" by Camille Flammarion
But, up to that epoch of my life, I had lived in vain.
"The Scarlet Letter" by Nathaniel Hawthorne
How to judge of the epoch.
"Scarabs" by Isaac Myer
Madame de Sevigne, in one of her many published letters, writes of the splendours which she saw at Conflans at this epoch.
"Royal Palaces and Parks of France" by Milburg Francisco Mansfield
The English Legislature is entirely repugnant to believe in 'new epochs.
"Past and Present" by Thomas Carlyle
Aged Nestor manifestly does not belong to the new epoch, he seems to have no sense of the deep spiritual struggle involved.
"Homer's Odyssey" by Denton J. Snider
His grandson, he would say, had been born in a glorious epoch, the best of all.
"The Dead Command" by Vicente Blasco Ibáñez
We are thus led to refer the origin of the lunar craters to some ancient epoch in the moon's history.
"The Story of the Heavens" by Robert Stawell Ball
It is to this epoch that all writers refer the elevation of its most ancient edifices.
"Museum of Antiquity" by L. W. Yaggy
Name three epochs into which the subject of touch may be divided.
"Great Pianists on Piano Playing" by James Francis Cooke
The energy and inventiveness of this extraordinary man marked an epoch wherever they were applied.
"A Popular History of Astronomy During the Nineteenth Century" by Agnes M. (Agnes Mary) Clerke
In writing of the final epoch in McGill's first century, and the larger McGill of our day, we must of necessity be brief.
"McGill and its Story, 1821-1921" by Cyrus Macmillan
It is a document which, more than any other, links together the different epochs of English history.
"A History of England Principally in the Seventeenth Century, Volume I (of 6)" by Leopold von Ranke
Ruskin notes that the art epochs have also been epochs of war, upheaval, and tyranny.
"A Man's Value to Society" by Newell Dwight Hillis
As the concrete humanity, so single nations have epochs of gestation, and epochs of normal activity, of growth, of full life, of manhood.
"Diary from March 4, 1861, to November 12, 1862" by Adam Gurowski
Their installation, which was announced as an epoch of triumph, disappointed the expectation of the court, and of their friends.
"Roman Catholicism in Spain" by Anonymous
To explain this, it is necessary to remember the epochs when the facts were consigned to writing.
"The Unknown Life of Jesus Christ" by Nicolas Notovitch
The bourgeois epoch is the epoch of minds in full play.
"Essays on the Materialistic Conception of History" by Antonio Labriola
To at least one pilgrim the Assembly of 1875 was monumental, for it marked an epoch in his life.
"The Story of Chautauqua" by Jesse Lyman Hurlbut
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In poetry:

Hapless nation! rent and torn,
Thou wert early taught to mourn,
Warfare of six hundred years -
Epochs marked with blood and tears!
"The Wake of William Orr" by William Drennan
How much of Godhood did it take --
What purging epochs had to pass,
Ere I was fit for leaf and lake
And worthy of the patient grass?
"How Much Of Godhood" by Louis Untermeyer
A little, and his rays, far-flown,
Gleam in the dews upon her grave,
The storied pomps her epochs gave
A dust within her deserts lone.
"The Testimony of the Suns" by George Sterling
How pure the light their legions shed!
How calm above the crumbling tomb
Of race and epoch passed to gloom
No ray can pierce nor mortal tread!
"The Testimony of the Suns" by George Sterling
This is an epoch-making time;
God thunders through the universe
A message glorious and sublime,
At once a blessing and a curse.
Blessings for those who seek His light,
Curses for those whose law is might.
"The Hour" by Ella Wheeler Wilcox
Long since forgotten—here they rest,
Sons of a distant land,—
The epochs of their short career
Mere footprints on life’s sand;
But this stone will tell through many a year,
They died on our shores, and they slumber here.
"The Emigrants’ Monument At Point St. Charles" by Rosanna Eleanor Leprohon

In news:

Gone are the days of go-it-alone foreign policy, of unilateral preemption and epoch-making events scheduled solely "at a time and place of our choosing".
We Haven't Seen Any Evolution Since the Pleistocene Epoch.
But on Veterans Day I had to work full time on myself in order to combat the feeling of an epochal shift, in which my own poor molecules were being realigned in some bizarre Hegelian synthesis.
And now they've finally got a peek at what Frank Miller's epochal comic looks like wrapped in its new cartoon skin.
Futurist Paul Saffo On The New Business Epoch.
Epoch to host storyteller Jane Kavanau.
Epoch Assisted Living at Melbourne will host a presentation by storyteller Jane Kavanau at 2:30 pm on Monday, Dec 3.
Deep Time is a band that cracks sonic earth in a new epoch.
Olympus NDT Inc, Waltham, MA, has introduced the Epoch LTC digital ultrasonic flaw detector.
This handheld instrument is the smallest in the line of Epoch flaw detectors.
Another look at the life of Voltaire , the 18th-century philosophe whom many would call the greatest, most interesting man of his epoch.
Prom night, if popular movies and television shows are to believed, is nothing less than epochal in the life of a teen-ager.
Leading the group were shares of Epoch Holding (EPHC), up about 26.8% and shares of Federated Investors (FII) up about 0.8% on the day.
The quartet continues its three-concert focus on Beethoven 's epoch-making late quartets.
An epoch ago when I got my first home loan, it seemed like robbing the bank.
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In science:

It would be hard to see how the silicate dust at that epoch could have been larger than, say a few hundredths of a micron.
Cosmic Dust in the 21st Century
We have thought it useful to present a preliminary set of results for extinction and emission based on the idea that the dust which first appears in high-z galaxies is indeed not like what is observed in later epochs.
Cosmic Dust in the 21st Century
SPs are very efficiently produced by the various mechanisms at post inflatory epochs .
Grand Unification Signal from Ultra High Energy Cosmic Rays?
L(S, z ), z ] is the epoch-dependent luminosity function and dV /dz is the differential volume element.
High-Redshift Galaxies: The Far-Infrared and Sub-Millimeter View
However, given the uncertainties in identifying equivalent source structure between epochs and frequency bands, we prefer to express this as an upper limit to the expansion rate of 4000 km s−1 (a radial expansion rate of 2000 km s−1 ).
Global VLBI Observations of Compact Radio Sources in M82
In an earlier paper, Pedlar et al. (1999) described the results of the first two epochs which consisted of observations conducted by the European VLBI Network in 1986 and 1997.
Global VLBI Observations of Compact Radio Sources in M82
T is the epoch separation in years and D2 /D1 is the ratio of the remnant sizes at the two epochs.
Global VLBI Observations of Compact Radio Sources in M82
However, when imaged with the EVN at the 1997.5 epoch it showed structure more consistent with an identification as a supernova remnant.
Global VLBI Observations of Compact Radio Sources in M82
In the present epoch, the star formation rate is percolating at a much lower rate and we are only able to see the spectrum of clusters from associations to open cluster.
The Formation of Star Clusters
Therefore explanations for both the amount of universal pre-heating and the epoch at which it is applied are required in external heating scenarios.
Entropy Evolution in Galaxy Groups and Clusters; A Comparison of External and Internal Heating
The GAg models for galaxy groups are most satisfactory since the stellar mass distribution and formation epoch t∗ are designed with groups in mind.
Entropy Evolution in Galaxy Groups and Clusters; A Comparison of External and Internal Heating
As the ob jects are Miras, variations at different epochs are expected.
Planetary nebula or symbiotic Mira? Near infrared colours mark the difference
These two methods have an advantage over the classical primary distance indicators such as Cepheids and RR Lyraes in that the distances to galaxies can be determined reliably from single epoch observations.
Determination of the Distance to M33 Based on the Tip of the Red Giant Branch and the Red Clump
Two important classes of treatments are applicable to binary black hole systems toward the end of the orbital epoch.
Modeling gravitational radiation from coalescing binary black holes
ST theories are indistinguishable from GR at late radiation epoch and during matter dominated era.
General relativity limit of the scalar-tensor theories for traceless matter field
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