periods

noun

1. A length of time.“There was a period of confusion following the announcement.”
2. A period of time in history seen as a single coherent entity; an epoch, era.“Food rationing continued in the post-war period.”
3. The punctuation mark “.” (indicating the ending of a sentence or marking an abbreviation).
4. 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.