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Epoch
Definitions
- 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 An intensive chemotherapy regimen for treating aggressive non-Hodgkin lymphoma, consisting of etoposide, prednisolone, Oncovin (vincristine), cyclophosphamide, and hydroxydaunorubicin. uncountable
- 3 a unit of geological time that is a subdivision of a period and is itself divided into ages wordnet
- 4 A notable event which marks the beginning of such a period.
- 5 a period marked by distinctive character or reckoned from a fixed point or event wordnet
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- 6 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"
- 7 (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded wordnet
- 8 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."
- 9 One complete presentation of the training data set to an iterative machine learning algorithm.
"The neural network was trained over 500 epochs."
- 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."
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.
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.
Acronym, from the initial letters of the various drugs.
See also for "epoch"
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