Entry 1 sense Webster, 1913 Gravitational /grăvˌ-ĭt-āsh'-ən-əl/ · Grav·i·tation·al · IPA /ˌɡɹævɪˈteɪʃənəl/ 01 a. Of or pertaining to the force of gravity; as, gravitational units. 1. Of or pertaining to the force of gravity; as, gravitational units.(Physics)