1. A period marked by distinctive character or reckoned from a fixed point or event
   "The Victorian epoch in British history";
   - era
    
2. (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
   "The astronomer used January 1, 2000 as the epoch for the star catalogue";
   - date of reference
    
3. A unit of geological time that is a subdivision of a period and is itself divided into ages
   "The Pleistocene epoch was characterized by repeated glaciations"
    
4. (machine learning) one iteration of learning with the full sample of training data
   "The neural network was trained for 100 epochs"

Derived forms: epochs

Type of: date, geologic time, geological time, period, period of time, time period, time span

Part of: geological period, period

Encyclopedia: Epoch