English

adequal

From ad- + equal.

A compound of ad- + equal

Proto-Indo-European *h₂éd ‘near, at’

Proto-Italic *ad ‘toward, to, on, up to, for’

Latin ad ‘to, towards’

English ad-

Old Latin aiquos

Latin aequus

Latin aequālis ‘equal’

Middle English equal ‘identical in amount’

English equal

Today it means

adj Approximately equal, in the context of infinitesimal calculus.

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