English to English
1. an amount of time
a time period of 30 years|hastened the period of time of his recovery|Picasso's blue period
2. the interval taken to complete one cycle of a regularly repeating phenomenon
3. (ice hockey) one of three divisions into which play is divided in hockey games
4. a unit of geological time during which a system of rocks formed
ganoid fishes swarmed during the earlier geological periods
5. the end or completion of something
death put a period to his endeavors|a change soon put a period to my tranquility
6. the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
the women were sickly and subject to excessive menstruation|a woman does not take the gout unless her menses be stopped|the semen begins to appear in males and to be emitted at the same time of life that the catamenia begin to flow in females
7. a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations
in England they call a period a stop
8. A portion of time as limited and determined by some recurring 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.
9. To put an end to.
10. To come to a period; to conclude. [Obs.] "You may period upon this, that," etc.