The length of time for which something exists or is current or valid.
The length of time for which an organism lives.
Some clams have lifespans far longer than those of human beings.
A length of time.
The punctuation mark “.” (indicating the ending of a sentence or marking an abbreviation).
One or more additional intervals to decide a tied game, an overtime period.
A complete sentence, especially one expressing a single thought or making a balanced, rhythmic whole.
A period of time in history seen as a single coherent entity; an epoch, era.
The length of time during which the same characteristics of a periodic phenomenon recur, such as the repetition of a wave or the rotation of a planet.
An end or conclusion; the final point of a process etc.
A section of an artist's, writer's (etc.) career distinguished by a given quality, preoccupation etc.
A geochronologic unit of millions to tens of millions of years; a subdivision of an era, and subdivided into epochs.
Each of the divisions into which a school day is split, allocated to a given subject or activity.
Each of the intervals, typically three, of which a game is divided.
A Drosophila gene, the gene product of which is involved in regulation of the circadian rhythm.
The length of an interval over which a periodic function, periodic sequence or repeating decimal repeats; often the least such length.
Female menstruation; an episode of this.
A row in the periodic table of the elements.
A decisive end to something; a stop.
Two phrases (an antecedent and a consequent phrase).
That's final; that's the end of the matter (analogous to a period ending a sentence); end of story.
Designating anything from a given historical era.
Evoking, or appropriate for, a particular historical period, especially through the use of elaborate costumes and scenery.