epochKK [ˈɛpək] ｜ /ˈɛpək/
GEPT 中高級
C1noun
a period of time characterized by a particular quality or feature, often starting from a significant event or moment
The discovery of electricity marked the beginning of a new epoch in human history.
時代；紀元
C2noun
a division of geological time, smaller than a period and larger than an age
The extinction of dinosaurs marked the end of the Mesozoic era, and the beginning of the Cenozoic era, which is further divided into the Paleogene, Neogene and Quaternary epochs.
C1noun
in astronomy, a fixed point of time used as a reference for recording celestial information such as the coordinates of a celestial body
The positions of celestial objects are measured relative to the epoch of 1950.
曆元（天文）