a unit of geological time that is a subdivision of a period and is itself divided into ages
a period marked by distinctive character or reckoned from a fixed point or event 同义词:era,
(astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded 同义词:date of reference,
其他语种释义
epochとは意味:epoch n. 新紀元; 画期的な出来事; 画期的な時代; 〔地質〕 世(せい). 【動詞+】 ◆American labor-saving inventions form an epoch in the history of the human race. アメリカにおける労働節約の諸発明は人類史上に一新紀元を画するものだ ◆This reform marks an epoch in educ...