epoch

名词 n. 动词 v.
中文释义
英 /ˈiːpɒk/|/ˈɛpɒk/|/ˈɛpək/    美 /ˈɛp.ək/|/ˈɛpˌɑk/|/ˈiˌpɑk/|/ˈeɪˌpɑk/

英文释义

名词 n.
  1. A particular period of history, or of a person's life, especially one considered noteworthy or remarkable.
    — I grew bitter in my words—I believed the worst of everyone; nay, I sometimes doubted the affection of my kind, my indulgent parents. But let me hastily pass over this vain and profitless epoch,—the fierce tempest, and the weary calm, were but the appointed means by which I reached the harbour of faith and rest.
  2. A notable event which marks the beginning of such a period.
  3. A specific instant in time, chosen as the point of reference or zero value of a system that involves identifying instants of time.
    — UNIX epoch; J2000 epoch
  4. A geochronologic unit of hundreds of thousands to millions of years; a subdivision of a period, and subdivided into ages (or sometimes subepochs).
    — Now during the time of the glacial epoch the greatest distance of the sun in winter was 98¼ millions of miles, whereas it is now, in winter, only 91½ millions of miles, the mean distance being taken as 93 million miles.
  5. One complete presentation of the training data set to an iterative machine learning algorithm.
    — The neural network was trained over 500 epochs.
动词 v.
  1. To divide (data) into segments by time period. transitive
    — The continuous data were epoched into segments of 1500 ms (starting 500 ms before visual stimulus onset), time-locked to stimulus onset (0 ms) and sorted according to experimental conditions.

词形变化

epochs plural epocha alternative epochs present,singular,third-person epoching participle,present epoched participle,past epoched past epocha alternative

词汇关系

衍生词
Amazonian epoch Belle Époque epochful epochism epochmaking epoch-making epochwise Genesee epoch habitable epoch Hesperian epoch Noachian epoch Planck epoch
相关词
epochal epoche epochless

词源

词源 1
From Medieval Latin epocha, from Ancient Greek ἐποχή (epokhḗ, “a check, cessation, stop, pause, epoch of a star, i.e., the point at which it seems to halt after reaching the highest, and generally the place of a star; hence, a historical epoch”), from ἐπέχω (epékhō, “to hold in, check”), from ἐπι- (epi-, “upon”) + ἔχω (ékhō, “to have, hold”). Doublet of epoche.
词源 2
From Medieval Latin epocha, from Ancient Greek ἐποχή (epokhḗ, “a check, cessation, stop, pause, epoch of a star, i.e., the point at which it seems to halt after reaching the highest, and generally the place of a star; hence, a historical epoch”), from ἐπέχω (epékhō, “to hold in, check”), from ἐπι- (epi-, “upon”) + ἔχω (ékhō, “to have, hold”). Doublet of epoche.
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