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单词 period
释义

WordReference Random House Learner's Dictionary of American English © 2024
pe•ri•od /ˈpɪriəd/USA pronunciation   n. [countable]
  1. an extent of time meaningful in the life of a person, in history, etc.:a period of illness.
  2. a round of time marked by some repeating event or action:the rainy period.
  3. Sportany of the parts into which something, as a school day, etc., is divided:She has gym in the first period.
  4. Grammarthe point or character (.) used to mark the end of a declarative sentence or to indicate an abbreviation;
    a full stop.
  5. Physiology
    • an occurrence of menstruation.

adj. [before a noun]
  1. noting or relating to a certain historical period:a period play.

interj. 
  1. (used to express the opinion that a decision is final):I forbid you to go, period.

WordReference Random House Unabridged Dictionary of American English © 2024
pe•ri•od  (pērē əd),USA pronunciation 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. Educationa specific length of time during school hours that a student spends in a classroom, laboratory, etc., or has free.
  7. Sportany 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. Grammarthe point or character (.) used to mark the end of a declarative sentence, indicate an abbreviation, etc.;
    full stop.
  11. Grammara full pause, as is made at the end of a complete sentence;
    full stop.
  12. Poetry, Rhetorica sentence, esp. a well-balanced, impressive sentence:the stately periods of Churchill.
  13. Poetry, Rhetoric, Grammara periodic sentence.
  14. Physiologyan occurrence of menstruation.
  15. Physiologya time of the month during which menstruation occurs.
  16. Geologythe 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. Physicsthe duration of one complete cycle of a wave or oscillation;
    the reciprocal of the frequency.
  18. Music and Dancea 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. Astronomy
    • AstronomyAlso called period of rotation. the time in which a body rotates once on its axis.
    • AstronomyAlso called period of revolution. the time in which a planet or satellite revolves once about its primary.
  20. MathematicsSee under periodic (def. 5).
  21. Poetry[Class. Pros.]a group of two or more cola.

adj. 
  1. 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. 
  1. (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.
  • Greek períodos circuit, period of time, period in rhetoric, literally, way around. See peri-, -ode2
  • Medieval Latin periodus, Latin
  • Middle French)
  • late Middle English periode (1375–1425
    • 1.See corresponding entry in Unabridged See age. 
    • 2.See corresponding entry in Unabridged term.

Collins Concise English Dictionary © HarperCollins Publishers::
period /ˈpɪərɪəd/ n
  1. a portion of time of indefinable length: he spent a period away from home
  2. a portion of time specified in some way: the Arthurian period, Picasso's blue period
  3. (as modifier): period costume
  4. a nontechnical name for an occurrence of menstruation
  5. a unit of geological time during which a system of rocks is formed: the Jurassic period
  6. a division of time, esp of the academic day
  7. the time taken to complete one cycle of a regularly recurring phenomenon; the reciprocal of frequency
    Symbol: T
  8. the time interval between two successive maxima or minima of light variation of a variable star
  9. one of the horizontal rows of elements in the periodic table. Each period starts with an alkali metal and ends with a rare gas
    Compare group
  10. rare a completion or end
Etymology: 14th Century peryod, from Latin periodus, from Greek periodos circuit, from peri- + hodos way
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