'Subdominant' definitions:
Definition of 'subdominant'
(from WordNet)
noun
(music) the fourth note of the diatonic scale
Definition of 'Subdominant'
From: GCIDE
- Subdominant \Sub*dom"i*nant\, n. (Mus.) The fourth tone above, or fifth below, the tonic; -- so called as being under the dominant. [1913 Webster]