a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations | a period marked by distinctive character or reckoned from a fixed point or event |
the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | a unit of geological time that is a subdivision of a period and is itself divided into ages |
an amount of time | (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded |
the interval taken to complete one cycle of a regularly repeating phenomenon | |
a unit of geological time during which a system of rocks formed | |
the end or completion of something | |
(ice hockey) one of three divisions into which play is divided in hockey games | |