geological era
English Thesaurus
1. a major division of geological time; an era is usually divided into two or more periods (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 | : | paleozoic, paleozoic era, |
| definition | : | from 544 million to about 230 million years ago (noun.time) |
| part holonym | : | geological period, period, |
| definition | : | a unit of geological time during which a system of rocks formed (noun.time) |
| part meronym | : | aeon, eon, |
| definition | : | the longest division of geological time (noun.time) |
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