The word 'vocal' originates from the Latin root 'vox, vocis', meaning "voice". This root descends from the Proto-Indo-European 'wekʷ-', which carried the fundamental sense of speaking or uttering. The suffix '-al', derived from Latin '-alis', is a common adjectival ending indicating relation or pertaining to. Thus, the literal construction "pertaining to the voice" directly informs its modern meanings, from describing sounds produced by the voice to characterizing a person who is outspoken.

Structure: voc (voice) + al (adjective suffix) voc (Latin: vox, vocis, meaning "voice", root) + al (Latin: -alis, meaning "pertaining to", adjective-forming suffix)