\En`har*mon"ic\, Enharmonical \En`har*mon"ic*al\, a.
[Gr. ? ?, ? fitting, accordant; ? in + ? harmony: cf. F.
enharmonique.]
1. (Anc. Mus.) Of or pertaining to that one of the three
   kinds of musical scale (diatonic, chromatic, enharmonic)
   recognized by the ancient Greeks, which consisted of
   quarter tones and major thirds, and was regarded as the
   most accurate.
2. (Mus.)
   (a) Pertaining to a change of notes to the eye, while, as
       the same keys are used, the instrument can mark no
       difference to the ear, as the substitution of A[flat]
       for G[sharp].
   (b) Pertaining to a scale of perfect intonation which
       recognizes all the notes and intervals that result
       from the exact tuning of diatonic scales and their
       transposition into other keys.