era - definition, thesaurus and related words from WordNet-Online

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Noun era has 2 senses

era, epoch - a period marked by distinctive character or reckoned from a fixed point or event
--₁ is a kind of time period, period of time, period
--₁ has particulars:
Caliphate; Christian era, Common era; day; historic period, age; modern era
era, geological era - a major division of geological time; an era is usually divided into two or more periods
--₂ is a kind of geological time, geologic time
--₂ is a part of eon, aeon
--₂ has parts: period, geological period
--₂ has particulars:
Cenozoic, Cenozoic era, Age of Mammals; Mesozoic, Mesozoic era, Age of Reptiles; Paleozoic, Paleozoic era