Factor (chord)

[1] In harmony, the consonance and dissonance of a chord factor and a nonchord tone are distinguished, respectively.

A chord contains exactly as many factors as it contains unique pitch names (octaves don't matter), while a voicing can have any number of voices that draw from and represent some or all the factors of a chord in various octaves.

For example, the figure to the right shows a four-note voicing of a C Major triad, which has three chord factors.

The chord factor called the "fifth" (pitch name "G") is represented in voice 2 (shown in red).

In real applications, it is common practice to omit the eleventh from voicings of a dominant 13 chord, because though being necessary to theoretically derive the thirteenth by stacking on it, the unaltered perfect eleventh clashes with the major third.

Fifth (G), in red, of a C major chord ( Play ⓘ ).
Seventh (F) of a third inversion dominant seventh chord in C (G7) ( Play ⓘ ).
Dominant thirteenth extended chord : C E G B ♭ D F A play ⓘ . The upper structure or extensions, i.e. notes beyond the seventh, in red (ninth, eleventh, thirteenth).