English

subfrequency

From sub- + frequency.

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

Proto-Italic *supo ‘under’

Latin sub ‘under, beneath, below’

English sub-

Proto-Italic *frekʷents

Latin frequens ‘crowded, crammed, packed’

Latin frequentia ‘crowd, multitude, throng’

Today it means

noun A secondary or subsidiary frequency.

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

Etymograph / subfrequency