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  1. Oxford American Dictionary

    period

    • IPA[ˈpirēəd]

    美式

    • n.
      a length or portion of time；a portion of time in the life of a nation, civilization, etc. characterized by the same prevalent features or conditions
    • adj.
      belonging to or characteristic of a past historical time, especially in style or design

    • noun: period, plural noun: periods

    • 釋義

    名詞

    • 1. a length or portion of time he had long periods of depression the period 1977–85 同義詞 time, spell, interval, stretch, term, ... 更多
    • ▪ a portion of time in the life of a nation, civilization, etc. characterized by the same prevalent features or conditions the early medieval period 同義詞 era, age, epoch, time, days, ... 更多
    • ▪ a major division of geological time that is a subdivision of an era and is itself subdivided into epochs, corresponding to a system in chronostratigraphy the Cretaceous period
    • ▪ one of the set divisions of the day in a school allocated to a lesson or other activity two periods of PE are allocated on the timetable he interviewed the teachers when they had a free period 同義詞 lesson, class, session
    • ▪ each of the intervals into which the playing time of a sporting event is divided the Lightnings ran at the Leafs hard in a very rough first period
    • 2. the interval of time between successive occurrences of the same state in an oscillatory or cyclic phenomenon, such as a mechanical vibration, an alternating current, a variable star, or an electromagnetic wave.
    • ▪ the time taken by a celestial object to rotate around its axis, or to make one circuit of its orbit.
    • ▪ the interval between successive equal values of a periodic function.
    • 3. a flow of blood and other material from the lining of the uterus, occurring in nonpregnant women at intervals of about 28 days between puberty and menopause and typically lasting for a few days she's got her period period pains 同義詞 menstruation, menstrual flow, informalthe curse, monthlies, time of the month, ... 更多
    • 4. North American a punctuation mark (.) used at the end of a sentence or an abbreviation. 同義詞 point, stop, full stop, full point
    • ▪ North American informal added to the end of a statement to indicate that no further discussion is possible or desirable he is the sole owner of the trademark, period 同義詞 and that's that, and that is the end of the matter, finis, full stop
    • 5. a set of elements occupying an entire horizontal row in the periodic table.
    • 6. a complex sentence, especially one consisting of several clauses, constructed as part of a formal speech or oration.
    • ▪ a complete idea, typically consisting of two or four phrases.

    形容詞

    • 1. belonging to or characteristic of a past historical time, especially in style or design a splendid selection of period furniture