(1):
(v. i.) To comment freely; to discourse with fullness and particularity; to discourse at large.
(2):
(v. i.) A discourse formed on its theme, like variations on a musical air; a comment or comments.
(3):
(v. i.) To sing a variation or accomplishment.
(4):
(v. i.) Originally, a double song; a melody or counterpoint sung above the plain song of the tenor; a variation of an air; a variation by ornament of the main subject or plain song.
(5):
(v. i.) The upper voice in part music.
(6):
(v. i.) The canto, cantus, or soprano voice; the treble.