adjective
also bool·i·an ˈbülēən
Usage: usually capitalized
Etymology: George Boole died 1864 English mathematician and logician + English -an, -ian
: of, relating to, or being a logical system (as Boolean algebra) that represents symbolically relationships (as those implied by and, or, and not used as logical operators) between entities (as sets, propositions, or on-off computer circuit elements)
boolean expression
boolean search strategy for information retrieval