Meaning of “period” - Learner’s Dictionary

period

noun [ C ] uk us /ˈpɪəriəd/
TIME

B1 a length of time:

a 24-hour period
a period of four months
SCHOOL/SPORTS

B1 one of the equal parts of time that a school day or sports game is divided into

WOMEN

the time each month when blood comes out of a woman's uterus

MARK US (UK full stop)

a mark (.) used at the end of a sentence, or to show that the letters before it are an abbreviation

(Definition of “period” from the Cambridge Learner’s Dictionary © Cambridge University Press)