banzai Syllabification: (ban·zai)Pronunciation: /ˈbanˌzī/Definition of banzai exclamation 1a Japanese battle cry. [ early 20th century] 2a form of greeting used to the Japanese emperor. [ late 19th century] adjective (especially of Japanese troops) attacking fiercely and recklessly:a banzai chargeOrigin:Japanese, literally 'ten thousand years (of life to you)'banzai in other Oxford dictionaries Definition of banzai in the British & World English dictionary