Meaning

• A length of time.

  "There was a period of confusion following the announcement."

• A period of time in history seen as a single coherent entity; an epoch, era.

  "Food rationing continued in the post-war period."

• 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.

  "When she is on her period, she prefers not to go swimming."

• A 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."

• Each of the divisions into which a school day is split, allocated to a given subject or activity.

  "I have math class in second period."

• Each of the intervals into which various sporting events are divided.

  "Gretzky scored in the last minute of the second period."

• 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.

Meaning

• To come to a period; to conclude.

• To put an end to.

Meaning

• Designating anything from a given historical era.

  "a period TV commercial"

• Evoking, or appropriate for, a particular historical period, especially through the use of elaborate costumes and scenery.

Meaning

• That'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!"