a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations | a body of students who graduate together |
the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause | the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun |
an amount of time | a period of time containing 365 (or 366) days |
the interval taken to complete one cycle of a regularly repeating phenomenon | a period of time occupying a regular part of a calendar year that is used for some particular activity |
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 | |