Definition of epochs:
(n) :
A particular period of history, or of a person's life, especially one considered noteworthy or remarkable.
(n) :
A notable event which marks the beginning of such a period.
(n) :
(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.
(n) :
(machine learning) One complete presentation of the training data set to an iterative machine learning algorithm.
(n) :
(geology) A geochronologic unit of hundreds of thousands to millions of years; a subdivision of a period, and subdivided into ages (or sometimes subepochs).
(v) :
(sciences, transitive) To divide (data) into segments by time period.