(US) Initialism of Equal Rights Amendment. / (EU, railways) Initialism of European Railway Agency (called today the European Union Agency for Railways)

(baseball) Initialism of earned run average, a baseball statistic. / (electronics) Initialism of electrically reconfigurable array. / (military) Initialism of explosive reactive armor.

A time period of indeterminate length, generally more than one year. / (geology) A geochronologic unit of tens to hundreds of millions of years; a subdivision of an eon, and subdivided into periods.

plural of ERA

plural of era

A calendrical system dating from after the death of the Buddha (taken as 543 BCE).

Synonym of Planck epoch

Common Era

The historical period characterized by the existence of digital technology.

Any of several periods of history noted for a particular style of art, architecture, literature or music termed classical