The interval between the root and the fifth tone above it.
A diatonic interval of five notes. Its ratio is 2:3, the diapente of the ancients.

"By affinity the notes group in chords. The tonic is the center chord, the key of harmony; the dominant is the fifth above it and the subdominant the fifth below it, and these two are balanced on the center chord as the scales on a balance beam. The dominant chord is vigorous and active, tending to soar; the subdominant is solemn, soft, and grave, tending to sink; the tonic is melodious and restful, and in it the harmony of equilibrium. This far AFFINITY." [Scientific Basis and Build of Music, page 91]

See Also

Major Fifth
minor fifth
Perfect Fifth
Table 11.02 - Fifth is Double Tone
7.14 - Fifth
11.13 - Dominant Conditions are Mated Opposing Pairs as Fifths
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