Online Google Dictionary

epoch 中文解釋 wordnet sense Collocation Usage
Noun
/ˈepək/,
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epochs, plural;
  1. A period of time in history or a person's life, typically one marked by notable events or particular characteristics
    • - the Victorian epoch
  2. The beginning of a distinctive period in the history of someone or something
    • - welfare reform was an epoch in the history of U.S. social policy
  3. A division of time that is a subdivision of a period and is itself subdivided into ages, corresponding to a series in chronostratigraphy
    • - the Pliocene epoch
  4. An arbitrarily fixed date relative to which planetary or stellar measurements are expressed


  1. era: a period marked by distinctive character or reckoned from a fixed point or event
  2. (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
  3. a unit of geological time that is a subdivision of a period and is itself divided into ages
  4. Epoch is an anthology of science fiction stories edited by Roger Elwood and Robert Silverberg, issued in hardcover by Berkley Putnam in 1975 and in paperback by Berkley in 1977. The table of contents includes Arm by Larry Niven; Angel of Truth by Gordon Eklund; Mazes by Ursula K. ...
  5. In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as celestial coordinates, or elliptical orbital elements of a celestial body, where these are (as usual) subject to perturbations and vary with time. ...
  6. Epoch, in comics, may refer to: *Epoch (DC Comics), a DC Comics time-traveling character *Epoch (Marvel Comics), a Marvel Comics character, the offspring of Eon
  7. Epoch Co., Ltd. is a Japanese toy and computer games company founded in 1958 which is best known for manufacturing Barcode Battler and Doraemon video games. Its current Representative President is Michihiro Maeda
  8. This timeline of the Big Bang describes the history of the universe according to the prevailing scientific theory of how the universe came into being, using the cosmological time parameter of comoving coordinates. ...
  9. Epoch, also known as The Lord of Time, is a comic book fictional character published by DC Comics. He first appeared in Justice League of America #10 (March 1962) and was created by writer Gardner Fox and artist Mike Sekowsky.
  10. A particular period of history, especially one considered remarkable or noteworthy; A notable event which marks the beginning of such a period; A precise instant of time that is used as a reference point; A precise instant of time that is used as a reference point (e.g. ...
  11. (i) The date at which a the co-ordinates on a star chart will be correct with respect to precession. (ii) The date of reference in astronomical calculations.
  12. One subdivision of a geologic period, often chosen to correspond to a stratigraphic series. Also used for a division of time corresponding to a paleomagnetic interval.
  13. A standard 30 second duration of the sleep recording that is assigned a sleep stage designation; for special purposes, occasionally longer or shorter epochs are scored.
  14. Presentation of the set of training (input and/or target) vectors to a network and the calculation of new weights and biases. Note that training vectors can be presented one at a time or all together in a batch.
  15. A specific instant in time. GPS carrier phase measurements are made at a given frequency (e.g. every 30 seconds) or epoch rate.
  16. A time or point of time. Used for the definition of celestial coordinate systems which change with time, such as the equatorial coordinate system (Right ascension/Declination) and consequently catalogs and atlasses of celestial objects. Commonly used epochs are J2000. ...
  17. the origin of an integrated temporal CS.
  18. A period of history; in Unix, “The Epoch” begins at 00:00:00 UTC January 1, 1970. This is considered the “dawn of time” by Unix and Unix-like operating systems, and all other time is calculated relative to this date.
  19. The coordinates commonly use for the celestial sphere, which are analogous to latitude and longitude for the Earth's surface, are called right ascension and declination. The "prime meridian" of this system passes through the position of the Sun at the time of the vernal equinox. ...
  20. Sometimes used to refer to a group of successively acquired samples, and, thus, related to a chunk.
  21. a period of time considered in terms of noteworthy and characteristic events, developments, persons, etc.
  22. A period of time for which an object displays a particular behaviour. Any one object is in a single epoch at one time, but interacting objects may be in different epochs at the time of interaction.
  23. A time segment extracted from a larger series of images, usually corresponding to the period in time surrounding an event of interest.
  24. A period in time marked by particular events and features.
  25. An instant in time for which the positions of celestial objects are given.