Definitions
a unit of geological time that is a subdivision of a period and is itself divided into ages
Word origin
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.
Used in a sentence
“And it occasionally happens that a period in which one had, hitherto, been mainly looking for the coming to birth of new things, suddenly reveals itself as an epoch of fading and decay.”
“UNIX epoch; J2000 epoch”
“Appendix A gives formulae for the calculation of the orbital elements of the planets at any time referred to the mean ecliptic and equinox of the epoch of noon on 1st January 2000; this is called the J2000 epoch.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Geologic time unit”5 letters
02“Historical era”5 letters
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