(n): one of the four quantities that are the basis of systems of measurement
(n): the interval taken to complete one cycle of a regularly repeating phenomenon
(n): a definite length of time marked off by two instants
(n): (ice hockey) one of three divisions into which play is divided in hockey games
(n): one of the portions into which something is regarded as divided and which together constitute a whole
(n): a unit of geological time during which a system of rocks formed
(n): the time of the physical formation and development of the earth (especially prior to human history)
(n): the end or completion of something
(n): the point in time at which something ends
(n): the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause
(n): any of several bodily processes by which substances go out of the body
(n): a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations
(n): the marks used to clarify meaning by indicating separation of words into sentences and clauses and phrases
capitalize every sentence and end it with a period