Entry 1 sense Webster, 1913 Brobdingnagian /brôbˌ-dĭg-năg'-ē-ən/ · Brob·ding·nag·i·an · IPA /ˌbɹɒbdɪŋˈnaɡɪən/ 01 a. Colossal; of extraordinary height; gigantic. 1. Colossal; of extraordinary height; gigantic.