[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).