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 for The period
From The Collaborative International Dictionary of English v.0.48 :

  Period \Pe"ri*od\, n. [L. periodus, Gr. peri`odos a going round,
     a way round, a circumference, a period of time; peri` round,
     about + "odo`s a way: cf. F. p['e]riode.]
     1. A portion of time as limited and determined by some
        recurring or cyclic phenomenon, as by the completion of a
        revolution of one of the heavenly bodies; a division of
        time, as a series of years, months, or days, in which
        something is completed, and ready to recommence and go on
        in the same order; as, the period of the sun, or the
        earth, or a comet; the period of an electromagnetic wave
        is the time interval between maxima.
        [1913 Webster]
     2. Hence: A stated and recurring interval of time; more
        generally, an interval of time specified or left
        indefinite; a certain series of years, months, days, or
        the like; a time; a cycle; an age; an epoch; as, the
        period of the Roman republic.
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              How by art to make plants more lasting than their
              ordinary period.                      --Bacon.
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     3. (Geol.) One of the great divisions of geological time; as,
        the Tertiary period; the Glacial period. See the Chart of
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     4. The termination or completion of a revolution, cycle,
        series of events, single event, or act; hence, a limit; a
        bound; an end; a conclusion. --Bacon.
        [1913 Webster]
              So spake the archangel Michael; then paused,
              As at the world's great period.       --Milton.
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              Evils which shall never end till eternity hath a
              period.                               --Jer. Taylor.
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              This is the period of my ambition.    --Shak.
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     5. (Rhet.) A complete sentence, from one full stop to
        another; esp., a well-proportioned, harmonious sentence.
        "Devolved his rounded periods." --Tennyson.
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              Periods are beautiful when they are not too long.
                                                    --B. Johnson.
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     Note: The period, according to Heyse, is a compound sentence
           consisting of a protasis and apodosis; according to
           Becker, it is the appropriate form for the coordinate
           propositions related by antithesis or causality.
           [1913 Webster]
     6. (Print.) The punctuation point [.] that marks the end of a
        complete sentence, or of an abbreviated word.
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     7. (Math.) One of several similar sets of figures or terms
        usually marked by points or commas placed at regular
        intervals, as in numeration, in the extraction of roots,
        and in circulating decimals.
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     8. (Med.) The time of the exacerbation and remission of a
        disease, or of the paroxysm and intermission.
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     9. (Mus.) A complete musical sentence.
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     10. (Sports) One of the specified time intervals into which a
         game is divided; as, there are three periods in a hockey
     11. (Education) One of the specified time intervals into
         which the academic day is divided; as, my calculus class
         is in the first period.
     12. The time interval during which a woman is menstruating,
         or the event of a single menstruation; as, her period was
         late this month.
     The period, the present or current time, as distinguished
        from all other times.
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     Syn: Time; date; epoch; era; age; duration; limit; bound;
          end; conclusion; determination.
          [1913 Webster]

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