era

1. is a type of: period, period of time, time period - an amount of time
   subtypes:

   • day - an era of existence or influence
   • age, historic period - an era of history having some distinctive feature
   • modern era - the present or recent times
   specific instances:

   • caliphate - 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
   • christian era, common era - the time period beginning with the supposed year of Christ's birth
   same as: epoch
2. is a type of: geologic time, geological time - the time of the physical formation and development of the earth (especially prior to human history)
   specific instances:

   • age of mammals, cenozoic, cenozoic era - approximately the last 63 million years
   • age of reptiles, mesozoic, mesozoic era - from 230 million to 63 million years ago
   • paleozoic, paleozoic era - from 544 million to about 230 million years ago
   has: geological period, period - a unit of geological time during which a system of rocks formed
   is a part of: aeon, eon - the longest division of geological time
   same as: geological era
3. referred to in: ball, baseball, baseball game - a ball game played with a bat and ball between two teams of nine players; teams take turns at bat trying to score runs
   is a type of: criterion, measure, standard, touchstone - a basis for comparison; a reference point against which other things can be evaluated
   same as: earned run average

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