produce a tone which, (often a third or a fifth from the tonic but may also be an octave from the tonic or other seventh or ninth etc.,) is part of the intended cord, or harmony.
To transform a chord by moving each of its tones by a certain number of scale degrees, as determined by the tones of the chord's keyscale. For example, to harmonize a C Major chord in the Keyscale of C Ionian by one step, we move C to D, E to F, and G to A. The resulting D minor chord is the second chord harmony of C Ionian.