vestibular UK /vɛˈstɪb.jʊl.ə/US /vɛˈstɪb.jəl.ɚ/adjective 4noun 1forms 3 adjective4 •Of or pertaining to a vestibule in a building (or railway coach).[…]while the outer world was fenced off by the interposed atrium or vestibular cloister,[…]. — 1861 •Of, pertaining to, or functioning as a vestibule (body cavity). •Of or pertaining to the vestibule of the inner ear and the perception of body position, balance and movement.Ampulla of the perpendicular semicircular canal, receiving a fasciculus from the superior branch of the vestibular nerve[…]. — 1859 •Of or pertaining to the surface of a tooth that is directed outward toward the vestibule of the mouth, including the buccal and labial surfaces, and opposite the lingual (or oral) surface. noun1 •A competitive examination used by Brazilian universities to select students. formsvestibulars · more vestibular · most vestibular