period of time

1. is a type of: fundamental measure, fundamental quantity - one of the four quantities that are the basis of systems of measurement
   subtypes:

   • test period, trial period - a period of time during which someone or something is tested
   • time frame - a time period during which something occurs or is expected to occur
   • grace, grace period - a period of time past the deadline for fulfilling an obligation during which a penalty that would be imposed for being late is waived, especially an extended period granted as a special favor
   • hours - an indefinite period of time
   • downtime - a period of time when something (as a machine or factory) is not operating (especially as a result of malfunctions)
   • uptime - a period of time when something (as a machine or factory) is functioning and available for use
   • work time - a time period when you are required to work
   • time off - a time period when you are not required to work
   • bout - a period of illness
   • hospitalization - a period of time when you are confined to a hospital
   • travel time - a period of time spent traveling
   • times - a more or less definite period of time now or previously present
   • time - an indefinite period (usually marked by specific attributes or activities)
   • elapsed time - the time that elapses while some event is occurring
   • continuance, duration - the period of time during which something continues
   • calendar week, week - a period of seven consecutive days starting on Sunday
   • midweek - the middle of a week
   • field day - a time of unusual pleasure and success
   • life, life-time, lifespan, lifetime - the period during which something is functional (as between birth and death)
   • life - the period between birth and the present time
   • life - the period from the present until death
   • millenary, millennium - a span of 1000 years
   • bimillenary, bimillennium - a span of 2000 years
   • occupation - the period of time during which a place or position or nation is occupied
   • past - a earlier period in someone's life (especially one that they have reason to keep secret)
   • shelf life - the length of time a packaged food or drug will last without deteriorating
   • puerperium - time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved
   • lactation - the period following birth during which milk is secreted
   • time of life - a period of time during which a person is normally in a particular life state
   • calendar day, civil day - a day reckoned from midnight to midnight
   • festival - a day or period of time set aside for feasting and celebration
   • day, daylight, daytime - the time after sunrise and before sunset while it is light outside
   • forenoon, morn, morning, morning time - the time period between dawn and noon
   • dark, night, nighttime - the time after sunset and before sunrise while it is dark outside
   • night - the time between sunset and midnight
   • night - the period spent sleeping
   • night - a period of ignorance or backwardness or gloom
   • eve - the period immediately before something
   • evening - the early part of night (from dinner until bedtime) spent in a special way
   • hebdomad, week - any period of seven consecutive days
   • fortnight, two weeks - a period of fourteen consecutive days
   • weekend - a time period usually extending from Friday night through Sunday; more loosely defined as any period of successive days including one and only one Sunday
   • indian summer, saint martin's summer - a period of unusually warm weather in the autumn
   • year - the period of time that it takes for a planet (as, e.g., Earth or Mars) to make a complete revolution around the sun
   • school, school day, schooltime - the period of instruction in a school; the time period when school is in session
   • twelvemonth, year, yr - a period of time containing 365 (or 366) days
   • year - a period of time occupying a regular part of a calendar year that is used for some particular activity
   • semester - half a year; a period of 6 months
   • bimester - a period of 2 months
   • olympiad - one of the four-year intervals between Olympic Games; used to reckon time in ancient Greece for twelve centuries beginning in 776 BC
   • lustrum - a period of five years
   • decade, decennary, decennium - a period of 10 years
   • century - a period of 100 years
   • quadrennium - a period of four years
   • quinquennium - a period of five years
   • half-century - a period of 50 years
   • quarter-century - a period of 25 years
   • quarter - a fourth part of a year; three months
   • phase of the moon - a time when the Moon presents a particular recurring appearance
   • day - the period of time taken by a particular planet (e.g. Mars) to make a complete rotation on its axis
   • calendar month, month - one of the twelve divisions of the calendar year
   • mid-january - the middle part of January
   • mid-february - the middle part of February
   • mid-march - the middle part of March
   • mid-april - the middle part of April
   • mid-may - the middle part of May
   • mid-june - the middle part of June
   • mid-july - the middle part of July
   • mid-august - the middle part of August
   • mid-september - the middle part of September
   • mid-october - the middle part of October
   • mid-november - the middle part of November
   • mid-december - the middle part of December
   • time limit - a time period within which something must be done or completed
   • term - a limited period of time
   • trimester - a period of three months; especially one of the three three-month periods into which human pregnancy is divided
   • hour - a special and memorable period
   • silly season - a time usually late summer characterized by exaggerated news stories about frivolous matters for want of real news
   • golden age - (classical mythology) the first and best age of the world, a time of ideal happiness, prosperity, and innocence; by extension, any flourishing and outstanding period
   • silver age - (classical mythology) the second age of the world, characterized by opulence and irreligion; by extension, a period secondary in achievement to a golden age
   • bronze age - (classical mythology) the third age of the world, marked by war and violence
   • iron age - (classical mythology) the last and worst age of the world
   • great year, platonic year - time required for one complete cycle of the precession of the equinoxes, about 25,800 years
   • regulation time - (sports) the normal prescribed duration of a game
   • extra time, overtime - playing time beyond regulation, to break a tie
   • season, time of year - one of the natural periods into which the year is divided by the equinoxes and solstices or atmospheric conditions
   • canicular days, canicule, dog days - the hot period between early July and early September; a period of inactivity
   • midwinter - the middle of winter
   • season - a recurrent time marked by major holidays
   • season - a period of the year marked by special events or activities in some field
   • age, long time, years - a prolonged period of time
   • long haul, long run - a period of time sufficient for factors to work themselves out
   • drought, drouth - a prolonged shortage
   • epoch, era - a period marked by distinctive character or reckoned from a fixed point or event
   • generation - the normal time between successive generations
   • prehistoric culture, prehistory - the time during the development of human culture before the appearance of the written word
   • reign - a period during which something or somebody is dominant or powerful
   • run - the continuous period of time during which something (a machine or a factory) operates or continues in operation
   • early days, youth - an early period of development
   • dawn - an opening time period
   • evening - a later concluding time period
   • time - a period of time considered as a resource under your control and sufficient to accomplish something
   • nap, sleep - a period of time spent sleeping
   • lease, term of a contract - the period of time during which a contract conveying property to a person is in effect
   • half life, half-life - the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)
   • lunar time period, tide - there are usually two high and two low tides each day
   • phase, stage - any distinct time period in a sequence of events
   • multistage - occurring in more than one stage
   • watch - the period during which someone (especially a guard) is on duty
   • peacetime - a period of time during which there is no war
   • wartime - a period of time during which there is armed conflict
   • duty tour, enlistment, hitch, term of enlistment, tour, tour of duty - a period of time spent in military service
   • honeymoon - the early (usually calm and harmonious) period of a relationship; business or political
   • indiction - a 15-year cycle used as a chronological unit in ancient Rome and adopted in some medieval kingdoms
   • prohibition, prohibition era - the period from 1920 to 1933 when the sale of alcoholic beverages was prohibited in the United States by a constitutional amendment
   • incubation period - the period between infection and the appearance of symptoms of the disease
   • rainy day - a (future) time of financial need
   • noviciate, novitiate - the period during which you are a novice (especially in a religious order)
   • bloom, blossom, efflorescence, flower, flush, heyday, peak, prime - the period of greatest prosperity or productivity
   • running time - the length of time that a movie or tv show runs
   • clotting time - the time it takes for a sample of blood to clot; used to diagnose some clotting disorders
   • air alert - the time period during which military and civilian agencies are prepared for an enemy air attack
   • question time - a period during a parliamentary session when members of British Parliament may ask questions of the ministers
   • real time - (computer science) the time it takes for a process under computer control to occur
   • real time - the actual time that it takes a process to occur
   • study hall - a period of time during the school day that is set aside for study
   • usance - the period of time permitted by commercial usage for the payment of a bill of exchange (especially a foreign bill of exchange)
   • window - the time period that is considered best for starting or finishing something
   specific instances:

   • bronze age - (archeology) a period between the Stone and Iron Ages, characterized by the manufacture and use of bronze tools and weapons
   • iron age - (archeology) the period following the Bronze Age; characterized by rapid spread of iron tools and weapons
   • stone age - (archeology) the earliest known period of human culture, characterized by the use of stone implements
   • eolithic, eolithic age - the earliest part of the Stone Age marked by the earliest signs of human culture
   • palaeolithic, paleolithic, paleolithic age - second part of the Stone Age beginning about 750,000 to 500,000 years BC and lasting until the end of the last ice age about 8,500 years BC
   • lower paleolithic - the oldest part of the Paleolithic Age with the emergence of the hand ax; ended about 120,000 years ago
   • middle paleolithic - the time period of Neanderthal man; ended about 35,000 years BC
   • upper paleolithic - the time period during which only modern Homo sapiens was known to have existed; ended about 10,000 years BC
   • epipaleolithic, mesolithic, mesolithic age - middle part of the Stone Age beginning about 15,000 years ago
   • neolithic, neolithic age, new stone age - latest part of the Stone Age beginning about 10,000 BC in the Middle East (but later elsewhere)
   • great schism - the period from 1378 to 1417 during which there were two papacies in the Roman Catholic Church, one in Rome and one in Avignon
   same as: period, time period

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