When used in contrast with root position, an inversion of a chord is any voicing where the root of the chord is not the bass note of the chord (lowest note). Chord voicings are inversions of each other when the two chords contain the same notes but are not the exact same voicing.

Two voicings are inversions of one another when moving individual notes in one chord by multiples of a perfect octave produces the other voicing, regardless of whether either voicing is in root position (bass note is the root note). As an example, G-C-E is an inversion of C-E-G, and vice versa.