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Noun period has 8 senses
  1. time period, period of time, period - an amount of time; "a time period of 30 years"; "hastened the period of time of his recovery"; "Picasso's blue period"
    --1 is a kind of fundamental quantity, fundamental measure
    --1 has particulars:
     trial period, test period; time frame; hours; downtime; uptime; work time; time off; hospitalization; travel time; time; elapsed time; duration, continuance; week, calendar week; field day; life, lifetime, lifespan; life; life; millennium; bimillennium, bimillenary; occupation; past; shelf life; puerperium; lactation; time of life; calendar day, civil day; festival; day, daytime, daylight; morning, morn, morning time, forenoon; night, nighttime, dark; night; night; night; eve; evening; week, hebdomad; fortnight, two weeks; weekend; Indian summer, Saint Martin's summer; year; school, schooltime, school day; year, twelvemonth, yr; year; semester; bimester; Olympiad; lustrum; decade, decennary, decennium; century; half-century; quarter-century; quarter; phase of the moon; day; calendar month, month; mid-January; mid-February; mid-March; mid-April; mid-May; mid-June; mid-July; mid-August; mid-September; mid-October; mid-November; mid-December; time limit; term; trimester; hour; silly season; Golden Age; silver age; bronze age; Bronze Age; iron age; Iron Age; Stone Age; Eolithic Age, Eolithic; Paleolithic Age, Paleolithic, Palaeolithic; Lower Paleolithic; Middle Paleolithic; Upper Paleolithic; Mesolithic Age, Mesolithic, Epipaleolithic; Neolithic Age, Neolithic, New Stone Age; great year, Platonic year; regulation time; overtime, extra time; season, time of year; dog days, canicule, canicular days; midwinter; season; season; long time, age, years; long run, long haul; drought; era, epoch; generation; prehistory, prehistoric culture; reign; run; youth, early days; dawn; evening; time; sleep, nap; lease, term of a contract; half life, half-life; tide, lunar time period; phase, stage; multistage; watch; peacetime; wartime; enlistment, hitch, term of enlistment, tour of duty, duty tour, tour; honeymoon; indiction; Depression, the Depression, the Great Depression; prohibition, prohibition era; incubation period; rainy day; novitiate, noviciate; flower, prime, peak, heyday, bloom, blossom, efflorescence, flush; running time; period, historic period, historical period; clotting time; air alert; question time; real time; real time; study hall; usance; window
  2. period - one of three periods of play in hockey games
    --2 is a kind of     playing period, period of play, play
  3. period, historic period, historical period - a stage in the history of a culture having a definable place in space and time; "a novel from the Victorian period"
    --3 is a kind of time period, period of time, period
  4. period - the interval taken to complete one cycle of a regularly repeating phenomenon
    --4 is a kind of     time interval, interval
    --4 has particulars: orbit period
  5. menstruation, menses, menstruum, catamenia, period, flow - the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause; "the women were sickly and subject to excessive menstruation"; "a woman does not take the gout unless her menses be stopped"--Hippocrates; "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"--Aristotle
    --5 is a kind of discharge, emission, expelling
    --5 has particulars: menorrhagia, hypermenorrhea; oligomenorrhea
  6. period, point, full stop, stop, full point - a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations; "in England they call a period a stop"
    --6 is a kind of punctuation, punctuation mark
    --6 has particulars: suspension point
  7. period, geological period - a unit of geological time during which a system of rocks formed; "ganoid fishes swarmed during the earlier geological periods"
    --7 is a kind of geological time, geologic time
    --7 is a part of era, geological era
    --7 has parts: epoch
    --7 has particulars:
     Quaternary, Quaternary period, Age of Man; Tertiary, Tertiary period; Cretaceous, Cretaceous period; Jurassic, Jurassic period; Triassic, Triassic period; Permian, Permian period; Carboniferous, Carboniferous period; Pennsylvanian, Pennsylvanian period, Upper Carboniferous, Upper Carboniferous period; Mississippian, Missippian period, Lower Carboniferous, Lower Carboniferous period; Devonian, Devonian period, Age of Fishes; Silurian, Silurian period; Ordovician, Ordovician period; Cambrian, Cambrian period; ice age, glacial period, glacial epoch
  8. period - the end or completion of something; "death put a period to his endeavors"; "a change soon put a period to my tranquility"
    --8 is a kind of     end, ending
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