UNISON (2)

unison (2). Unison, n. an unvaried note, agreement, concert

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U″ni‐son (?; 277), a. [[Cf. It. unisono. See Unison, n.]] 1. 1. Sounding alone.
intermixed with voice, Choral or unison. Milton. 2. 2. (Mus.) Sounded alike in pitch; unisonant; unisonous; as, unison passages, in which two or more parts unite in coincident sound.