(Or "whole nUMBer") One of the finite nUMBers in the infinite set ..., -3, -2, -1, 0, 1, 2, 3, ... An inductive definition of an integer is a nUMBer that is either zero or an integer plus or minus one. An integer is a nUMBer with no fractional part. If written as a fixed-point nUMBer, the part after the decimal (or other base) point will be zero. A natural nUMBer is a non-negative integer. (2002-04-07)