Dictionary:Complement

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(kam’ plē m∂nt) The difference between a particular value and full scale. In the decimal system, the complement of x is (10μ–x), where μ is a fixed number; and in binary the complement of x is (2μ–x). Adding the complement of x is equivalent to subtracting x, and computers often find it easier to generate the complement and add than to subtract. See also one’s complement and two’s complement.