A length of time.
A period of time in history seen as a single coherent entity; an epoch, era.
The punctuation mark “.” (indicating the ending of a sentence or marking an abbreviation).
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.
Female menstruation.
A section of an artist's, writer's (etc.) career distinguished by a given quality, preoccupation etc.
Each of the divisions into which a school day is split, allocated to a given subject or activity.
Each of the intervals into which various sporting events are divided.
The length of time for a disease to run its course.
An end or conclusion; the final point of a process etc.
A complete sentence, especially one expressing a single thought or making a balanced, rhythmic whole.
A specific moment during a given process; a point, a stage.
A row in the periodic table of the elements.
A subdivision of an era, typically lasting from tens to hundreds of millions of years, see Appendix: Geologic timescale.
A Drosophila gene, the gene product of which is involved in regulation of the circadian rhythm.
Two phrases (an antecedent and a consequent phrase).
The length of an interval over which a periodic function, periodic sequence or repeating decimal repeats; often the least such length.
End point, conclusion.
To come to a period; to conclude.
To put an end to.
Designating anything from a given historical era.
Evoking, or appropriate for, a particular historical period, especially through the use of elaborate costumes and scenery.
That's final; that's the end of the matter (analogous to a period ending a sentence); end of story