Epoch
WordNet
noun
(1) A unit of geological time
(2) A period marked by distinctive character or reckoned from a fixed point or event
(3) (astronomy) the precise date that is the point of reference for which information (as coordinates of a celestial body) is referred
WiktionaryText
Etymology
From < < < + .
Noun
- A particular period of history, especially one considered remarkable or noteworthy.
- A notable event which marks the beginning of such a period.
- A precise instant of time that is used as a reference point.
- A precise instant of time that is used as a reference point (e.g. January 1, 1970, 00:00:00 UTC).