epoch

noun5

1. •
   A particular period of history, or of a person's life, especially one considered noteworthy or remarkable.

   • 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. — 1924
2. •
   A geochronologic unit of hundreds of thousands to millions of years; a subdivision of a period, and subdivided into ages (or sometimes subepochs).
3. •
   One complete presentation of the training data set to an iterative machine learning algorithm.

   • The neural network was trained over 500 epochs.
4. •
   A specific instant in time, chosen as the point of reference or zero value of a system that involves identifying instants of time.

   • The .NET epoch is midnight at the start of January 1st, AD 1, although that's AD 1 in a proleptic Gregorian calendar, which refers to even more complexity we haven't talked about yet. — 2022
5. •
   A notable event which marks the beginning of such a period.

verb1

1. •
   To divide (data) into segments by time period.

   • The continuous data were epoched into segments of 1500 ms (starting 500 ms before visual stimulus onset), time-locked to stimulus onset (0 ms) and sorted according to experimental conditions. — 2015

noun1

1. •
   An intensive chemotherapy regimen for treating aggressive non-Hodgkin lymphoma, consisting of etoposide, prednisolone, Oncovin (vincristine), cyclophosphamide, and hydroxydaunorubicin.