S: (n) opening, gap (an open or empty space in or between things) "there was a small opening between the trees"; "the explosion made a gap in the wall"
S: (n) window (the time period that is considered best for starting or finishing something) "the expanded window will give us time to catch the thieves"; "they had a window of less than an hour when an attack would have succeeded"
S: (n) 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"
S: (n) time frame (a time period during which something occurs or is expected to occur) "an agreement can be reached in a reasonably short time frame"
S: (n) 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) "The payment had originally been due on April 1 but we had a grace period which expired in June."
S: (n) hours (an indefinite period of time) "they talked for hours"
S: (n) downtime (a period of time when something (as a machine or factory) is not operating (especially as a result of malfunctions))
S: (n) uptime (a period of time when something (as a machine or factory) is functioning and available for use)
S: (n) time off (a time period when you are not required to work) "he requested time off to attend his grandmother's funeral"
S: (n) bout (a period of illness) "a bout of fever"; "a bout of depression"
S: (n) hospitalization (a period of time when you are confined to a hospital) "now they try to shorten the patient's hospitalization"
S: (n) travel time (a period of time spent traveling) "workers were not paid for their travel time between home and factory"
S: (n) times (a more or less definite period of time now or previously present) "it was a sign of the times"
S: (n) time (an indefinite period (usually marked by specific attributes or activities)) "the time of year for planting"; "he was a great actor in his time"
S: (n) life, lifetime, life-time, lifespan (the period during which something is functional (as between birth and death)) "the battery had a short life"; "he lived a long and happy life"
S: (n) life (the period between birth and the present time) "I have known him all his life"
S: (n) life (the period from the present until death) "he appointed himself emperor for life"
S: (n) occupation (the period of time during which a place or position or nation is occupied) "during the German occupation of Paris"
S: (n) past (a earlier period in someone's life (especially one that they have reason to keep secret)) "reporters dug into the candidate's past"
S: (n) shelf life (the length of time a packaged food or drug will last without deteriorating)
S: (n) puerperium (time period following childbirth when the mother's uterus shrinks and the other functional and anatomic changes of pregnancy are resolved) "a perinatologist cared for her during the puerperium"
S: (n) lactation (the period following birth during which milk is secreted) "lactation normally continues until weaning"
S: (n) time of life (a period of time during which a person is normally in a particular life state)
S: (n) festival (a day or period of time set aside for feasting and celebration)
S: (n) day, daytime, daylight (the time after sunrise and before sunset while it is light outside) "the dawn turned night into day"; "it is easier to make the repairs in the daytime"
S: (n) night (the time between sunset and midnight) "he watched television every night"
S: (n) night (the period spent sleeping) "I had a restless night"
S: (n) night (a period of ignorance or backwardness or gloom)
S: (n) eve (the period immediately before something) "on the eve of the French Revolution"
S: (n) evening (the early part of night (from dinner until bedtime) spent in a special way) "an evening at the opera"
S: (n) week, hebdomad (any period of seven consecutive days) "it rained for a week"
S: (n) fortnight, two weeks (a period of fourteen consecutive days) "most major tennis tournaments last a fortnight"
S: (n) 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)
S: (n) 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) "a Martian year takes 687 of our days"
S: (n) school, schooltime, school day (the period of instruction in a school; the time period when school is in session) "stay after school"; "he didn't miss a single day of school"; "when the school day was done we would walk home together"
S: (n) year, twelvemonth, yr (a period of time containing 365 (or 366) days) "she is 4 years old"; "in the year 1920"
S: (n) year (a period of time occupying a regular part of a calendar year that is used for some particular activity) "a school year"
S: (n) time limit (a time period within which something must be done or completed)
S: (n) term (a limited period of time) "a prison term"; "he left school before the end of term"
S: (n) trimester (a period of three months; especially one of the three three-month periods into which human pregnancy is divided)
S: (n) hour (a special and memorable period) "it was their finest hour"
S: (n) silly season (a time usually late summer characterized by exaggerated news stories about frivolous matters for want of real news)
S: (n) 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)
S: (n) 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)
S: (n) bronze age ((classical mythology) the third age of the world, marked by war and violence)
S: (n) iron age ((classical mythology) the last and worst age of the world)
S: (n) great year, Platonic year (time required for one complete cycle of the precession of the equinoxes, about 25,800 years)
S: (n) regulation time ((sports) the normal prescribed duration of a game) "the game was finished in regulation time"
S: (n) season, time of year (one of the natural periods into which the year is divided by the equinoxes and solstices or atmospheric conditions) "the regular sequence of the seasons"
S: (n) season (a recurrent time marked by major holidays) "it was the Christmas season"
S: (n) season (a period of the year marked by special events or activities in some field) "he celebrated his 10th season with the ballet company"; "she always looked forward to the avocado season"
S: (n) long time, age, years (a prolonged period of time) "we've known each other for ages"; "I haven't been there for years and years"
S: (n) long run, long haul (a period of time sufficient for factors to work themselves out) "in the long run we will win"; "in the long run we will all be dead"; "he performed well over the long haul"
S: (n) drought, drouth (a prolonged shortage) "when England defeated Pakistan it ended a ten-year drought"
S: (n) era, epoch (a period marked by distinctive character or reckoned from a fixed point or event)
S: (n) generation (the normal time between successive generations) "they had to wait a generation for that prejudice to fade"
S: (n) reign (a period during which something or somebody is dominant or powerful) "he was helpless under the reign of his egotism"
S: (n) run (the continuous period of time during which something (a machine or a factory) operates or continues in operation) "the assembly line was on a 12-hour run"
S: (n) youth, early days (an early period of development) "during the youth of the project"
S: (n) dawn (an opening time period) "it was the dawn of the Roman Empire"
S: (n) evening (a later concluding time period) "it was the evening of the Roman Empire"
S: (n) time (a period of time considered as a resource under your control and sufficient to accomplish something) "take time to smell the roses"; "I didn't have time to finish"; "it took more than half my time"; "he waited for a long time"
S: (n) sleep, nap (a period of time spent sleeping) "he felt better after a little sleep"; "there wasn't time for a nap"
S: (n) lease, term of a contract (the period of time during which a contract conveying property to a person is in effect)
S: (n) 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))
S: (n) phase, stage (any distinct time period in a sequence of events) "we are in a transitional stage in which many former ideas must be revised or rejected"
S: (n) honeymoon (the early (usually calm and harmonious) period of a relationship; business or political)
S: (n) indiction (a 15-year cycle used as a chronological unit in ancient Rome and adopted in some medieval kingdoms)
S: (n) 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)
S: (n) incubation period (the period between infection and the appearance of symptoms of the disease)
S: (n) rainy day (a (future) time of financial need) "I am saving for a rainy day"
S: (n) novitiate, noviciate (the period during which you are a novice (especially in a religious order))
S: (n) clotting time (the time it takes for a sample of blood to clot; used to diagnose some clotting disorders)
S: (n) air alert (the time period during which military and civilian agencies are prepared for an enemy air attack)
S: (n) question time (a period during a parliamentary session when members of British Parliament may ask questions of the ministers)
S: (n) real time ((computer science) the time it takes for a process under computer control to occur)
S: (n) real time (the actual time that it takes a process to occur) "information is updated in real time"
S: (n) study hall (a period of time during the school day that is set aside for study)
S: (n) usance (the period of time permitted by commercial usage for the payment of a bill of exchange (especially a foreign bill of exchange))
S: (n) window (the time period that is considered best for starting or finishing something) "the expanded window will give us time to catch the thieves"; "they had a window of less than an hour when an attack would have succeeded"
S: (n) Bronze Age ((archeology) a period between the Stone and Iron Ages, characterized by the manufacture and use of bronze tools and weapons)
S: (n) Iron Age ((archeology) the period following the Bronze Age; characterized by rapid spread of iron tools and weapons)
S: (n) Stone Age ((archeology) the earliest known period of human culture, characterized by the use of stone implements)
S: (n) Eolithic Age, Eolithic (the earliest part of the Stone Age marked by the earliest signs of human culture)
S: (n) Paleolithic Age, Paleolithic, Palaeolithic (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)
S: (n) Lower Paleolithic (the oldest part of the Paleolithic Age with the emergence of the hand ax; ended about 120,000 years ago)