Hypertext Webster Gateway: "subdominant"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Subdominant \Sub*dom"i*nant\, n. (Mus.)
The fourth tone above, or fifth below, the tonic; -- so
called as being under the dominant.
From WordNet (r) 1.7 (wn)
subdominant
n : (music) the fourth note of the diatonic scale
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