vocal (adj.)

late 14c., "spoken, oral," from Old French vocal (13c.), from Latin vocalis "sounding, sonorous, speaking," as a noun, "a vowel," from vox (genitive vocis) "voice" (from PIE root *wekw- "to speak"). In reference to music (as opposed to instrumental), first recorded 1580s; meaning "outspoken" first attested 1871. Vocal cords is from 1872; see cord.

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Definitions of vocal from WordNet
vocal (adj.)
relating to or designed for or using the singing voice;
organized a vocal group to sing his compositions
vocal technique
the vocal repertoire
vocal (adj.)
having or using the power to produce speech or sound;
all vocal beings hymned their praise
vocal organs
vocal (adj.)
given to expressing yourself freely or insistently;
a vocal assembly
Synonyms: outspoken
vocal (adj.)
full of the sound of voices;
a playground vocal with the shouts and laughter of children
vocal (n.)
music intended to be performed by one or more singers, usually with instrumental accompaniment;
Synonyms: vocal music
vocal (n.)
a short musical composition with words;
Synonyms: song