From Latin 'audīre' (to hear), PIE *h₂ew- (to perceive) — kin to 'audience,' 'audio,' 'audit,' and surprisingly 'obey' (to listen toward).
From Late Latin 'audībilis' (that may be heard), from Latin 'audīre' (to hear, to listen), from PIE root *h₂ew- (to perceive, to see, to hear). The PIE root originally encompassed perception broadly — both seeing and hearing — and specialized to 'hearing' in Latin while specializing to 'perceiving/noticing' in other branches. The same Latin verb 'audīre' produced 'audience,' 'audio,' 'audit,' and 'obey' (through Old French
The English word 'obey' is a hidden relative of 'audible.' It comes from Old French 'obeir,' from Latin 'obēdīre' (to listen toward, to pay attention to), composed of 'ob-' (toward) and 'audīre' (to hear). To obey is literally to hear toward someone — to listen and comply. An 'obedient' child is, etymologically, one