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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
perineum perineurium perinials perinnals perinnial perinnials perino perintah period period at end period of calm period of play period of sickness period of time period piece period return periodc

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