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Eratosthenes
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Erebus, Mount
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era

e·ra [ rə, érrə ] (plural e·ras)


noun 
Definition:
 
1. time distinctive period of history: a period of time made distinctive by a significant development, feature, event, or personality
during the postwar era

2. time period with its own chronological system: a time period within which years are consecutively numbered from a particular significant event that provides its starting point
the Christian era

3. time date that begins period: a significant date or event that is regarded as the beginning of a new period of time
The agreement marked an era in U.S.-Soviet relations.

4. geology division of Earth's history: a division of geologic time comprising several periods
the Precambrian era

[Mid-17th century. < late Latin aera "number used as a basis for counting"]
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