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The Free On-line Dictionary of Computing (18 March 2015):

NAND Not AND. The Boolean function which is true unless both its arguments are true, the logical complement of AND: A NAND B = NOT (A AND B) = (NOT A) OR (NOT B) Its truth table is: A | B | A NAND B --+---+--------- F | F | T F | T | T T | F | T T | T | F NAND, like NOR, forms a complete set of Boolean functions on its own since it can be used to make NOT, AND, OR and any other Boolean function: NOT A = A NAND A A AND B = NOT (A NAND B) A OR B = (NOT A) NAND (NOT B) (1995-01-24)