epoch
英 ['iːpɒk; 'epɒk]
美['ɛpək]
- n. [地质] 世；新纪元；新时代；时间上的一点
英英释意
- 1. a period marked by distinctive character or reckoned from a fixed point or event
- 2. (astronomy) the precise date that is the point of reference for which information (as coordinates of a celestial body) is referred
- 3. a unit of geological time