Entry 1 sense Webster, 1913 Latitudinal /lătˌ-ət-o͞od'-ən-əl/ · Lat·i·tu·di·nal · IPA /lætɪˈtud(ɪ)nəl/ 01 a. Of or pertaining to latitude; in the direction of latitude. 1. Of or pertaining to latitude; in the direction of latitude.