ballistic Syllabification: (bal·lis·tic)Pronunciation: /bəˈlistik/Translate ballistic | into German | into Italian Definition of ballistic adjective [attributive] 1of or relating to projectiles or their flight. 2moving under the force of gravity only. Phrases go ballistic informal fly into a rage. Derivatives ballisticallyPronunciation: /-ik(ə)lē/ adverb Origin: late 18th century: from ballista + -icballistic in other Oxford dictionaries Definition of ballistic in the British & World English dictionary