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- [mathematics] An expression that results in a true or false (logical) condition. For example, in the Boolean expression "HEIGHT > 70 AND DIAMETER = 100," all locations where the height is greater than 70 and the diameter is equal to 100 would be given a value of 1, or true, and all locations where this criterion is not met would be given a value of 0, or false. Named for the English mathematician George Boole (1815-1864).