integer Syllabification: (in·te·ger)Pronunciation: /ˈintijər/Definition of integer noun 1a whole number; a number that is not a fraction. 2a thing complete in itself. Origin: early 16th century (as an adjective meaning 'entire, whole'): from Latin, 'intact, whole', from in- (expressing negation) + the root of tangere 'to touch'. Compare with entire, also with integral, integrate, and integrityinteger in other Oxford dictionaries Definition of integer in the British & World English dictionary