|1.||[ noun ] an amount of time|
|Synonyms:||period_of_time time_period amount_of_time|
"a time period of 30 years" "hastened the period of time of his recovery" "Picasso's blue period"
|Related terms:||measure fundamental_measure year week time season time phase night century day morning calendar_month season school year decade life life week long_time era weekend fortnight season point term generation year duration life past time_off millennium quarter-century hours incubation_period time_of_life festival youth day watch mid-June flower running_time Indian_summer drought reign half_life enlistment night night prohibition novitiate hour occupation silly_season trimester window silver_age bronze_age Golden_Age lactation lower_paleolithic upper_paleolithic air_alert bimillennium Iron_Age Eolithic_Age Bronze_Age Stone_Age iron_age Mesolithic_Age Paleolithic_Age great_year Neolithic_Age semester shelf_life elapsed_time overtime regulation_time dog_days Olympiad bimester midwinter lustrum calendar_day long_run prehistory dawn quarter half-century field_day work_time lease sleep evening tide multistage mid-January phase_of_the_moon peacetime wartime mid-March indiction honeymoon mid-May mid-April mid-February night rainy_day mid-July clotting_time time_frame uptime mid-September mid-August evening depression puerperium study_hall real_time mid-November test_period usance question_time hospitalization time_limit mid-December middle_paleolithic mid-October run eve real_time travel_time downtime|
|2.||[ noun ] (history) a stage in the history of a culture having a definable place in space and time|
"a novel from the Victorian period"
|3.||[ noun ] the interval taken to complete one cycle of a regularly repeating phenomenon|
|Related terms:||time_interval orbit_period|
|4.||[ noun ] a time of life characterized as a distinct phase|
"Picasso's blue period" "it was the happy period of my life"
|Related terms:||time_interval time_of_life orbit_period|
|5.||[ noun ] (biology,medicine) the monthly discharge of blood from the uterus of nonpregnant women from puberty to menopause|
|Synonyms:||menses catamenia flow menstruum menstruation|
"the women were sickly and subject to excessive menstruation" "a woman does not take the gout unless her menses be stopped"--Hippocrates
|Related terms:||discharge menorrhagia oligomenorrhea menstruate|
|6.||[ noun ] a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations|
|Synonyms:||full_stop stop full_point point|
"in England they call a period a stop"
|Related terms:||punctuation suspension_point point|
|7.||[ noun ] (geology) a unit of geological time during which a system of rocks formed|
"ganoid fishes swarmed during the earlier geological periods"
|Related terms:||geological_time Permian Cretaceous Jurassic ice_age Silurian Carboniferous Pennsylvanian Mississippian Devonian Ordovician Triassic Cambrian Tertiary Quaternary era epoch|
|8.||[ noun ] (sport,ice hockey) one of three periods of play in hockey games|
|9.||[ noun ] the end or completion of something|
"death put a period to his endeavors" "a change soon put a period to my tranquility"