epoch
English Thesaurus
1. a unit of geological time that is a subdivision of a period and is itself divided into ages (noun.time)
hypernym | : | geologic time, geological time, |
definition | : | the time of the physical formation and development of the earth (especially prior to human history) (noun.time) |
instance hyponym | : | glacial epoch, pleistocene, pleistocene epoch, |
definition | : | from two million to 11 thousand years ago; extensive glaciation of the northern hemisphere; the time of human evolution (noun.time) |
instance hyponym | : | pliocene, pliocene epoch, |
definition | : | from 13 million to 2 million years ago; growth of mountains; cooling of climate; more and larger mammals (noun.time) |
instance hyponym | : | miocene, miocene epoch, |
definition | : | from 25 million to 13 million years ago; appearance of grazing mammals (noun.time) |
instance hyponym | : | oligocene, oligocene epoch, |
definition | : | from 40 million to 25 million years ago; appearance of sabertoothed cats (noun.time) |
instance hyponym | : | eocene, eocene epoch, |
definition | : | from 58 million to 40 million years ago; presence of modern mammals (noun.time) |
instance hyponym | : | paleocene, paleocene epoch, |
definition | : | from 63 million to 58 million years ago; appearance of birds and earliest mammals (noun.time) |
part meronym | : | geological period, period, |
definition | : | a unit of geological time during which a system of rocks formed (noun.time) |
2. a period marked by distinctive character or reckoned from a fixed point or event (noun.time)
hyponym | : | day, |
definition | : | an era of existence or influence (noun.time) |
hyponym | : | age, historic period, |
definition | : | an era of history having some distinctive feature (noun.time) |
hyponym | : | modern era, |
definition | : | the present or recent times (noun.time) |
instance hyponym | : | caliphate, |
definition | : | the era of Islam's ascendancy from the death of Mohammed until the 13th century; some Moslems still maintain that the Moslem world must always have a calif as head of the community (noun.time) |
instance hyponym | : | christian era, common era, |
definition | : | the time period beginning with the supposed year of Christ's birth (noun.time) |
3. (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded (noun.time)
hypernym | : | date, |
definition | : | the particular day, month, or year (usually according to the Gregorian calendar) that an event occurred (noun.time) |
domain category | : | astronomy, uranology, |
definition | : | the branch of physics that studies celestial bodies and the universe as a whole (noun.cognition) |
4. a period marked by distinctive character or reckoned from a fixed point or event (noun.time)
derivation | : | epoch-making, epochal, |
definition | : | highly significant or important especially bringing about or marking the beginning of a new development or era (adj.all) |
derivation | : | epoch-making, epochal, |
definition | : | highly significant or important especially bringing about or marking the beginning of a new development or era (adj.all) |
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