Entry 1 sense Webster, 1913 ecological /(ē̇*kō̇"lŏj"ĭ*kal)/ · IPA /ˌiːkəˈlɒd͡ʒɪkl̩/ 01 adj. of or pertaining to ecology; as, an ecological disaster. 1. of or pertaining to ecology; as, an ecological disaster. Syn. bionomic, bionomical.