| 单词 | epoch |
| 释义 | epoch /ep"euhk/ or, esp. Brit., /ee"pok/, n. 1. a particular period of time marked by distinctive features, events, etc.: The treaty ushered in an epoch of peace and good will. 2. the beginning of a distinctive period in the history of anything: The splitting of the atom marked an epoch in scientific discovery. 3. a point of time distinguished by a particular event or state of affairs; a memorable date: His coming of age was an epoch in his life. 4. Geol. any of several divisions of a geologic period during which a geologic series is formed. Cf. age (def. 12). See table under geologic time. 5. Astron. a. an arbitrarily fixed instant of time or date, usually the beginning of a century or half century, used as a reference in giving the elements of a planetary orbit or the like. b. the mean longitude of a planet as seen from the sun at such an instant or date. 6. Physics. the displacement from zero at zero time of a body undergoing simple harmonic motion. [1605-15; < NL epocha < Gk epoché pause, check, fixed time, equiv. to ep- EP- + och- (var. s. of échein to have) + -e n. suffix] Syn. 1. age, date, era, time. See age. |
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