(phonetics)sonant; vocal, as distinguished from a sharp (non-sonant) consonant
(grammar) Not having an inflectional ending or sign, such as a noun used as an adjective, or an adjective as an adverb, without the addition of a formative suffix, or an infinitive without the sign "to".
(music) A note played a semitone lower than a natural, denoted by the symbol ♭ sign placed after the letter representing the note (e.g., B♭) or in front of the note symbol (e.g. ♭♪).