The Collaborative International Dictionary
Equisonance
Equisonance \E*quis"o*nance\, n. [Equi- + L. sonans, p. pr. of sonare to sound: cf. F. ['e]quisonnance. See Sonant.] (Mus.) An equal sounding; the consonance of the unison and its octaves.
Wiktionary
equisonance
n. (context music English) An equal sounding; the consonance of the unison and its octaves.