English

subera

From sub- + era.

Formed from sub- + era

Proto-Indo-European *upó ‘up; from below’

Proto-Italic *supo ‘under’

Latin sub ‘under, beneath, below’

English sub-

Late Latin aera ‘era, epoch’

English era

Today it means

noun An era making up part of a larger era.

Language periods are conventional ranges, not dates for this word.