Music and Acoustics. Designating the root or lowest note of a chord in its original (uninverted) form; belonging to the lowest note of a chord…

Music. Of a bass, cadence, etc.: belonging to the root or lowest note of a chord. Cf. fundamental, adj. 7a.

Relating to the supertonic of a scale; (esp. of a chord) having the supertonic as its root.

With preceding adjective, adverb, or noun: having roots of a specified kind or number.