1a number which is not a fraction; a whole number: [as modifier]:integer values
2a thing complete in itself.
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 integrity
integer in other Oxford dictionaries
Definition of integer in the US English dictionary