| 单词 | period |
| 释义 | period /pear"ee euhd/, n. 1. a rather large interval of time that is meaningful in the life of a person, in history, etc., because of its particular characteristics: a period of illness; a period of great profitability for a company; a period of social unrest in Germany. 2. any specified division or portion of time: poetry of the period from 1603 to 1660. 3. a round of time or series of years by which time is measured. 4. a round of time marked by the recurrence of some phenomenon or occupied by some recurring process or action. 5. the point of completion of a round of time or of the time during which something lasts or happens. 6. Educ. a specific length of time during school hours that a student spends in a classroom, laboratory, etc., or has free. 7. any of the parts of equal length into which a game is divided. 8. the time during which something runs its course. 9. the present time. 10. the point or character (.) used to mark the end of a declarative sentence, indicate an abbreviation, etc.; full stop. 11. a full pause, as is made at the end of a complete sentence; full stop. 12. a sentence, esp. a well-balanced, impressive sentence: the stately periods of Churchill. 13. a periodic sentence. 14. an occurrence of menstruation. 15. a time of the month during which menstruation occurs. 16. Geol. the basic unit of geologic time, during which a standard rock system is formed: comprising two or more epochs and included with other periods in an era. See table under geologic time. 17. Physics. the duration of one complete cycle of a wave or oscillation; the reciprocal of the frequency. 18. Music. a division of a composition, usually a passage of eight or sixteen measures, complete or satisfactory in itself, commonly consisting of two or more contrasted or complementary phrases ending with a conclusive cadence. 19. Astron. a. Also called period of rotation. the time in which a body rotates once on its axis. b. Also called period of revolution. the time in which a planet or satellite revolves once about its primary. 20. Math. See under periodic (def. 5). 21. Class. Pros. a group of two or more cola. adj. 22. noting, pertaining to, evocative of, imitating, or representing a historical period or the styles current during a specific period of history: period costumes; a period play. interj. 23. (used by a speaker or writer to indicate that a decision is irrevocable or that a point is no longer discussable): I forbid you to go, period. [1375-1425; late ME periode ( < MF) < ML periodus, L < Gk períodos circuit, period of time, period in rhetoric, lit., way around. See PERI-, -ODE2] Syn. 1. See age. 2. term. |
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