From Latin 'vox' (voice), from PIE *wekw- — same root as 'vocal,' 'vowel,' 'invoke,' and Greek 'epos' (epic).
The sound produced in a person's larynx and uttered through the mouth, as speech or song; also, the right or ability to express an opinion.
From Old French 'voiz' (voice, sound, word, rumor), from Latin 'vōx' (genitive 'vōcis,' voice, sound, utterance, word), from PIE *wṓkʷs (voice, speech), from *wekʷ- (to speak). The same PIE root produced Latin 'vocāre' (to call), which gave English 'vocal,' 'vocation' (a calling), 'invoke,' 'provoke,' 'advocate,' and 'vowel' (from 'vōcālis littera,' a voiced letter). Greek 'épos' (ἔπος, word, song, epic poetry) is from the same root, making