n.
1.an amount of time
2.one of three periods of play in hockey games
3.a stage in the history of a culture having a definable place in space and time
4.the interval taken to complete one cycle of a regularly repeating phenomenon
5.the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
6.a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations
7.a unit of geological time during which a system of rocks formed
8.the end or completion of something
