epoch
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.
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.
(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.
(sciences) To divide (data) into segments by time period.
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