gigantic Syllabification: (gi·gan·tic)Pronunciation: /jīˈgantik/Translate gigantic | into French | into German | into Italian | into Spanish Definition of gigantic adjective of very great size or extent; huge or enormous:a gigantic concrete towerDerivatives giganticallyPronunciation: /-ik(ə)lē/ adverb Origin: early 17th century (in the sense 'like or suited to a giant'): from Latin gigas, gigant- (see giant) + -icgigantic in other Oxford dictionaries Definition of gigantic in the British & World English dictionary