Definitions
1.nounA length of time."There was a period of confusion following the announcement."
2.nounA period of time in history seen as a single coherent entity; an epoch, era."Food rationing continued in the post-war period."
3.nounThe punctuation mark “.” (indicating the ending of a sentence or marking an abbreviation).
4.nounThe 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.
5.nounFemale menstruation."When she is on her period, she prefers not to go swimming."
6.nounA section of an artist's, writer's (etc.) career distinguished by a given quality, preoccupation etc."This is one of the last paintings Picasso created during his Blue Period."
7.nounEach of the divisions into which a school day is split, allocated to a given subject or activity."I have math class in second period."
8.nounEach of the intervals into which various sporting events are divided."Gretzky scored in the last minute of the second period."
9.nounThe length of time for a disease to run its course.
10.nounAn end or conclusion; the final point of a process etc.
11.nounA complete sentence, especially one expressing a single thought or making a balanced, rhythmic whole.
12.nounA specific moment during a given process; a point, a stage.
13.nounA row in the periodic table of the elements.
14.nounA subdivision of an era, typically lasting from tens to hundreds of millions of years, see Appendix: Geologic timescale.
15.nounA Drosophila gene, the gene product of which is involved in regulation of the circadian rhythm.
16.nounTwo phrases (an antecedent and a consequent phrase).
17.nounThe length of an interval over which a periodic function, periodic sequence or repeating decimal repeats; often the least such length.
18.nounEnd point, conclusion.
19.verbTo come to a period; to conclude.
20.verbTo put an end to.
21.adjectiveDesignating anything from a given historical era."a period TV commercial"
22.adjectiveEvoking, or appropriate for, a particular historical period, especially through the use of elaborate costumes and scenery.
23.interjectionThat's final; that's the end of the matter (analogous to a period ending a sentence); end of story"I know you don't want to go to the dentist but your teeth need to be checked, period!"