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. 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, especially 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. 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.
17. the duration of one complete cycle of a wave or oscillation; the reciprocal of the frequency.
18. 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; sentence (def. 3).
19. Astronomy.
• the time in which a body rotates once on its axis.
• the time in which a planet or satellite revolves once about its primary.
20. See under periodic¹ (def. 5).
21. a group of two or more cola.

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.

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.

1. a portion of time of indefinable length
• a portion of time specified in some way
• (as modifier)
3. a nontechnical name for an occurrence of menstruation
4. a unit of geological time during which a system of rocks is formed
5. a division of time, esp of the academic day
6. physics maths
• the time taken to complete one cycle of a regularly recurring phenomenon; the reciprocal of frequency
• an interval in which the values of a periodic function follow a certain pattern that is duplicated over successive intervals
7. astronomy
• the time required by a body to make one complete rotation on its axis
• the time interval between two successive maxima or minima of light variation of a variable star
8. one of the horizontal rows of elements in the periodic table. Each period starts with an alkali metal and ends with a rare gas
9. the punctuation mark (.) used at the end of a sentence that is not a question or exclamation, after abbreviations, etc
10. a complete sentence, esp a complex one with several clauses
11. a passage or division of a piece of music, usually consisting of two or more contrasting or complementary musical phrases and ending on a cadence
12. (in classical prosody) a unit consisting of two or more cola
13. a completion or end

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