Depending on context, epoch can refer to:

A period of time

• a distinctive historical period or era
• a unit of the geologic time scale, less than a period and greater than an age
• a phase in the development of the universe with distinctive properties

A moment in time

• an instant of origin chosen as the epoch (reference date) from which time is measured in a calendar era or in a computer system.
• an epoch (astronomy), a moment in time for which celestial coordinates or orbital elements are specified.
• a step in the training process of an artificial neural network

Epoch as a proper noun

• The Epoch Game Pocket Computer, an early handheld game console
• Epoch (Chrono Trigger), a flying time machine in role-playing game Chrono Trigger
• Epoch (DC Comics), a supervillain also known as the Lord of Time
• The Epoch Times, a Falun Gong-linked Chinese newspaper
• The Unix Epoch, 00:00:00 UTC on January 1, 1970.
• Epoch Javascript Calendar is an open source, GPL calendar component for use in web pages written in JavaScript

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