- Examples:
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Phanerozoic aeon
the period from about 5,400 million years ago until the present
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Age of Mammals
approximately the last 63 million years
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Quaternary period
last 2 million years
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Holocene epoch
approximately the last 10,000 years
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Pleistocene epoch
from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution
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Tertiary period
from 63 million to 2 million years ago
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Pliocene epoch
from 13 million to 2 million years ago; growth of mountains; cooling of climate; more and larger mammals
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Miocene epoch
from 25 million to 13 million years ago; appearance of grazing mammals
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Oligocene epoch
from 40 million to 25 million years ago; appearance of sabertoothed cats
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Eocene epoch
from 58 million to 40 million years ago; presence of modern mammals
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Paleocene epoch
from 63 million to 58 million years ago; appearance of birds and earliest mammals
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Age of Reptiles
from 230 million to 63 million years ago
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Cretaceous period
from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants
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Jurassic period
from 190 million to 135 million years ago; dinosaurs; conifers
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Triassic period
from 230 million to 190 million years ago; dinosaurs, marine reptiles; volcanic activity
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Paleozoic era
from 544 million to about 230 million years ago
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Permian period
from 280 million to 230 million years ago; reptiles
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Carboniferous period
from 345 million to 280 million years ago
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Upper Carboniferous period
from 310 million to 280 million years ago; warm climate; swampy land
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Lower Carboniferous period
from 345 million to 310 million years ago; increase of land areas; primitive ammonites; winged insects
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Devonian period
from 405 million to 345 million years ago; preponderance of fishes and appearance of amphibians and ammonites
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Silurian period
from 425 million to 405 million years ago; first air-breathing animals
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Ordovician period
from 500 million to 425 million years ago; conodonts and ostracods and algae and seaweeds
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Cambrian period
from 544 million to about 500 million years ago; marine invertebrates
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Precambrian period
the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
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Proterozoic aeon
from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
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Archaeozoic aeon
the time from 3,800 million years to 2,500 million years ago; earth's crust formed; unicellular organisms are earliest forms of life
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Priscoan aeon
the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life
- Types:
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geologic time, geological time
the time of the physical formation and development of the earth (especially prior to human history)
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biological time
the time of various biological processes
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cosmic time
the time covered by the physical formation and development of the universe
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civil time, local time, standard time
the official time in a local region (adjusted for location around the Earth); established by law or custom
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daylight saving, daylight savings, daylight-saving time, daylight-savings time
time during which clocks are set one hour ahead of local standard time; widely adopted during summer to provide extra daylight in the evenings
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nowadays, present
the period of time that is happening now; any continuous stretch of time including the moment of speech
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past, past times, yesteryear
the time that has elapsed
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future, futurity, hereafter, time to come
the time yet to come
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musical time
(music) the beat of musical rhythm
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continuum
a continuous nonspatial whole or extent or succession in which no part or portion is distinct or distinguishable from adjacent parts
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GMT, Greenwich Mean Time, Greenwich Time, UT, UT1, universal time
the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere
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continuance, duration
the property of enduring or continuing in time
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eternity, infinity
time without end
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beat, musical rhythm, rhythm
the basic rhythmic unit in a piece of music
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now
the momentary present
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here and now, moment, present moment
at this time
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date
the present
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yore
time long past
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bygone, water under the bridge
past events to be put aside
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old
past times (especially in the phrase `in days of old')
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history
the aggregate of past events
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kingdom come
the end of time
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history
the continuum of events occurring in succession leading from the past to the present and even into the future
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UTC, coordinated universal time
Greenwich Mean Time updated with leap seconds
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Atlantic Standard Time, Atlantic Time
standard time in the 4th time zone west of Greenwich, reckoned at the 60th meridian; used in Puerto Rico and the Virgin Islands and Bermuda and the Canadian Maritime Provinces
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EST, Eastern Standard Time, Eastern Time
standard time in the 5th time zone west of Greenwich, reckoned at the 75th meridian; used in the eastern United States
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CST, Central Standard Time, Central Time
standard time in the 6th time zone west of Greenwich, reckoned at the 90th meridian; used in the central United States
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MST, Mountain Standard Time, Mountain Time
standard time in the 7th time zone west of Greenwich, reckoned at the 105th meridian west; used in the mountain states of the United States
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PST, Pacific Standard Time, Pacific Time
standard time in the 8th time zone west of Greenwich, reckoned at the 120th meridian west; used in far western states of the United States
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Alaska Standard Time, Yukon Time
standard time in the 9th time zone west of Greenwich, reckoned at the 135th meridian west; used in Hawaii and most of Alaska
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Hawaii Standard Time, Hawaii Time
standard time in the 10th time zone west of Greenwich, reckoned at the 150th meridian west; used in Hawaii and the western Aleutian Islands
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Bering Standard Time, Bering Time
standard time in the 11th time zone west of Greenwich, reckoned at the 165th meridian west; used in the Midway Islands
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nonce, time being
the present occasion
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circadian rhythm
a daily cycle of activity observed in many living organisms
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change of life, climacteric, menopause
the time in a woman's life in which the menstrual cycle ends
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climacteric
a period in a man's life corresponding to menopause
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sidereal time
measured by the diurnal motion of stars
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solstice
either of the two times of the year when the sun is at its greatest distance from the celestial equator
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equinox
either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length
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gestation, gestation period
the period during which an embryo develops (about 266 days in humans)
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refractory period
(neurology) the time after a neuron fires or a muscle fiber contracts during which a stimulus will not evoke a response
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aeon, eon
the longest division of geological time
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alpha and omega
the first and last; signifies God's eternity
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geological period, period
a unit of geological time during which a system of rocks formed
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era, geological era
a major division of geological time; an era is usually divided into two or more periods
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epoch
a unit of geological time that is a subdivision of a period and is itself divided into ages
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time immemorial, time out of mind
the distant past beyond memory
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auld langsyne, good old days, langsyne, old times
past times remembered with nostalgia
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by-and-by
an indefinite time in the future
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today
the present time or age
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tonight
the present or immediately coming night
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yesterday
the recent past
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offing
the near or foreseeable future
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tomorrow
the near future
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manana
an indefinite time in the future
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common measure, common time, four-four time, quadruple time
a time signature indicating four beats to the bar
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duple time
musical time with two beats in each bar
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triple time
musical time with three beats in each bar
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pacing, tempo
(music) the speed at which a composition is to be played
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in time
in the correct rhythm