Subdominant

1 - The dominant below; the fourth tone of the Diatonic scale, in the same relation to the keynote from below as the dominant is from above.
2 - The fifth below or the fourth above any keynote.

"The subdominant, or lowest chord in the key - F, A, C, is the natural product of the first combination of the three primary ratios (2, 3, 5). Their second combination developes the tonic or middle chord C, E, G. The third combination develops the dominant or highest chord G, B, D.

keynote or root of F

F	A	C	subdominant
C	E	G	Tonic
G	B	D	Dominant

(from The Scientific Basis and Build of Music)

See Also

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11.13 - Dominant Conditions are Mated Opposing Pairs as Fifths
14.16 - Dominant
16.25 - Magnetic Attraction caused by Dominant Current of Electrical Stream
Dominant
Dominant Current
Figure 1.3.1 - Subdivisions of Matter and Energy according to Keely
Figure 14.05 - The Dominant is the Light of the Mind of Diety
Law of the Dominant
Superdominant

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