Definitions
noun
the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
noun
a unit of geological time during which a system of rocks formed
“ganoid fishes swarmed during the earlier geological periods”
noun
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”
noun
one of three divisions into which play is divided in hockey games
noun
the end or completion of something
“death put a period to his endeavors”
noun
the interval taken to complete one cycle of a regularly repeating phenomenon
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