1 a period of history or of a person's life marked by notable events.
2 the beginning of an era.
3 Geol. a division of a period, corresponding to a set of strata.
Phrases and idioms:
epoch-making remarkable, historic; of major importance.
Derivatives:
epochal adj.
Etymology: mod.L epocha f. Gk epokhe stoppage
Useful english dictionary. 2012.