1. An amount of time (synset 115137796)
    "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"
  2. The interval taken to complete one cycle of a regularly repeating phenomenon (synset 115315015)
  3. (ice hockey) one of three divisions into which play is divided in hockey games (synset 115283092)
  4. A unit of geological time during which a system of rocks formed (synset 115272329)
    "ganoid fishes swarmed during the earlier geological periods"
  5. The end or completion of something (synset 115169138)
    "death put a period to his endeavors"; "a change soon put a period to my tranquility"
  6. The monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause (synset 113534950)
    "the women were sickly and subject to excessive menstruation"; "a woman does not take the gout unless her menses be stopped"; "the semen begins to appear in males and to be emitted at the same time of life that the catamenia begin to flow in females"
  7. A punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations (synset 106856570)
    "in England they call a period a stop"

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