Definition of XOR
: a logical operator whose output is true when either of two inputs are true but not both The output varies according to the relative characteristics of the inputs, and by manipulating these the device can be made to perform the functions of all the kinds of logic gates used in computer circuitry (OR, NOR, AND, NAND and XOR). — D. E. Thomsen, Science News, 29 Oct. 1983 —called also exclusive or
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First Known Use of xor
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