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Webster 1913 Edition

Adj.

[

Uni-

sonant

. See

Being in unison; having the same degree of gravity or acuteness; sounded alike in pitch.

Adj.

Being in unison; having the same degree of gravity or acuteness.

unisonant ‎(not comparable)

Of a single sound; producing the same sound.
a pair of unisonant tuning-forks

producing the same sound