: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.
:any specified division or portion of time: poetry of the period from 1603 to 1660.
:a round of time or series of years by which time is measured.
:a round of time marked by the recurrence of some phenomenon or occupied by some recurring process or action.
:the point of completion of a round of time or of the time during which something lasts or happens.
:Education. a specific length of time during school hours that a student spends in a classroom, laboratory, etc., or has free.
:any of the parts of equal length into which a game is divided.
:the time during which something runs its course.
:the present time.
:the point or character used to mark the end of a declarative sentence, indicate an abbreviation, etc.; full stop.
:a full pause, as is made at the end of a complete sentence; full stop.
a sentence, especially a well-balanced, impressive sentence: the stately periods of Churchill.
:a periodic sentence.
:an occurrence of menstruation.
:a time of the month during which menstruation occurs.
:Geology. 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.
:Physics. the duration of one complete cycle of a wave or oscillation; the reciprocal of the frequency.
:Music. 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.
:Astronomy. Also called period of rotation .the time in which a body rotates once on its axis.Also called period of revolution .the time in which a planet or satellite revolves once about its primary.
:Mathematics. See under periodic.
:Classical Prosody. a group of two or more cola.
adj.形容词 adjective
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.