What does PERIOD mean?

noun

1. an amount of time“a time period of 30 years”
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”
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”
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”