a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations | the act of producing offspring or multiplying by such production |
the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | the production of heat or electricity |
an amount of time | a coming into being |
the interval taken to complete one cycle of a regularly repeating phenomenon | group of genetically related organisms constituting a single step in the line of descent |
a unit of geological time during which a system of rocks formed | all the people living at the same time or of approximately the same age |
the end or completion of something | the normal time between successive generations |
(ice hockey) one of three divisions into which play is divided in hockey games | a stage of technological development or innovation |