epoch

== English == === Alternative forms === epocha [17th–19th c.] === Etymology === 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, “I hold in, check”), from ἐπι- (epi-, “upon”) + ἔχω (ékhō, “I have, hold”). Doublet of epoche. === Pronunciation === (UK) IPA(key): /ˈiːpɒk/, /ˈɛpɒk/, /ˈɛpək/ (US) IPA(key): /ˈɛp.ək/, /ˈɛpˌɑk/, /ˈiˌpɑk/, /ˈeɪˌpɑk/ Rhymes: -iːpɒk, -ɛpək === Noun === epoch (plural epochs) A particular period of history, or of a person's life, especially one considered noteworthy or remarkable. Synonyms: age, (only in general usage) era A notable event which marks the beginning of such a period. (chronology, astronomy, computing) A specific instant in time, chosen as the point of reference or zero value of a system that involves identifying instants of time. Coordinate term: (cartography, engineering) datum (geology) A geochronologic unit of hundreds of thousands to millions of years; a subdivision of a period, and subdivided into ages (or sometimes subepochs). (machine learning) One complete presentation of the training data set to an iterative machine learning algorithm. Synonym: generation ==== Derived terms ==== ==== Related terms ==== epochal epoche, epoché epochless ==== Translations ==== === Verb === epoch (third-person singular simple present epochs, present participle epoching, simple past and past participle epoched) (sciences, transitive) To divide (data) into segments by time period. === Further reading === “epoch”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC. William Dwight Whitney, Benjamin E[li] Smith, editors (1911), “epoch”, in The Century Dictionary […], New York, N.Y.: The Century Co., →OCLC. “epoch”, in OneLook Dictionary Search. === Anagrams === Poche, chope, poché