C17: from Late Latin diaphōnia, from Greek, from diaphōnos discordant, from dia- + phōnē sound
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Examples from the Web for diaphony
He mentions organum and diaphony, and remarks that he finds the succession of fifths and fourths very tiresome.
This question appears to have led to the practice of what Hucbald called "diaphony."
He called his system an “organum” or “diaphony,” and to sing according to his rules was called to “organize” or “organate.”Critical & Historical Essays