FALSE

From Agepedia

FALSE, in music ; an epithet applied by theorists to certain chords, called false, because they do not contain all the intervals appertaining to those chords in their perfect state : as a fifth, consisting of only six semitonic degrees, is denominated a false fifth. Those intonations of the voice which do not truly express the intended intervals are also called false, as well as all illadjusted combinations; and those strings, pipes and other sonorous bodies, which, from the ill disposition of their parts, cannot be accurately tuned. Certain closes are likewise termed false, in contradistinction to the full or final close.