Entry 1 sense Webster, 1913 Adjectival · Ad·jec·ti·val · IPA /ˌæ.d͡ʒəkˈtaɪ.vəl/ 01 a. Of or relating to the relating to the adjective; of the nature of an adjective; adjective. 1. Of or relating to the relating to the adjective; of the nature of an adjective; adjective.