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 (geology) A geochronologic unit of hundreds of thousands to millions of years; a subdivision of a period, and subdivided into ages (or sometimes subepochs).
n (machine learning) One complete presentation of the training data set to an iterative machine learning algorithm.
v (sciences, transitive) To divide (data) into segments by time period.
n (medicine) An intensive chemotherapy regimen for treating aggressive non-Hodgkin lymphoma, consisting of etoposide, prednisolone, Oncovin (vincristine), cyclophosphamide, and hydroxydaunorubicin.