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  1. pe·ri·od
    IPA[ˈpirēəd]
  2. noun

    • 1. a length or portion of time:

      he had long periods of depression the period 1977–85 the training period is between 16 and 18 months the ale will be available for a limited period
    • 2. a portion of time in the life of a nation, civilization, etc. characterized by the same prevalent features or conditions:

      the early medieval period
      Synonym : era, age, epoch, time, days, years, eon, generation, date
    • 3. 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
    • 4. 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
      Synonym : lesson, class, session
    • 5. 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
    • 6. 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.

    • 7. the time taken by a celestial object to rotate around its axis, or to make one circuit of its orbit.

    • 8. the interval between successive equal values of a periodic function.

    • 9. a flow of blood and other material from the lining of the uterus, lasting for several days and occurring in sexually mature women who are not pregnant at intervals of about one lunar month until the onset of menopause:

      she's got her period period pains
      Synonym : menstruation, menstrual flow, the curse, monthlies, time of the month, menses, time, flowers
    • 10. a punctuation mark (.) used at the end of a sentence or an abbreviation.

      Synonym : point, stop, full stop, full point
    • 11. 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
      Synonym : and that's that, and that is the end of the matter, finis, full stop
    • 12. a set of elements occupying an entire horizontal row in the periodic table.

    • 13. a complex sentence, especially one consisting of several clauses, constructed as part of a formal speech or oration.

    • 14. a complete idea, typically consisting of two or four phrases.

    adjective

    • 1. belonging to or characteristic of a past historical time, especially in style or design:

      a splendid selection of period furniture
  3. Variation

    • n.: noun: period, plural noun: periods

    • noun

      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:

    • adjective

      belonging to or characteristic of a past historical time, especially in style or design:
    • noun

      the period over which eggs, cells, etc. are incubated.

      the period between exposure to an infection and the appearance of the first symptoms:

    • noun

      the period between infection with a virus or other microorganism and the onset of symptoms, or between exposure to radiation and the appearance of a cancer.

      the delay between the receipt of a stimulus by a sensory nerve and the response to it.

    • noun

      a period in the earth's history when polar and mountain ice sheets were unusually extensive across the earth's surface.
    • noun

      a time or stage in a person's development when they are more responsive to certain stimuli and quicker to learn particular skills.
    • noun

      a television or film production set in a particular historical period and characterized by the use of costumes, sets, and props that are typical or evocative of the era:
    • noun

      the time between successive conjunctions of a planet with the sun:
    • noun

      an object or work that is set in or strongly reminiscent of an earlier historical period:
    • noun

      the period of revolution of one body around another with respect to the distant stars.
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