Period

an amount of time

the interval taken to complete one cycle of a regularly repeating phenomenon

(ice hockey) one of three divisions into which play is divided in hockey games

a unit of geological time during which a system of rocks formed

the end or completion of something

the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause

a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations