*adjective*
**Etymology:** George *Boole* died 1864 English mathematician
of, relating to, or being a logical combinatorial system (as Boolean algebra) that represents symbolically relationships (as those implied by the logical operators AND, OR, and NOT) between entities (as sets, propositions, or on-off computer circuit elements)

Example: *Boolean* expression

Example: *Boolean* search strategy for information retrieval

1. Boolean algebra. 2. (bool) The type of an expression with two possible values, "true" and "false". Also, a variable of Boolean type or a function with Boolean arguments or result. The most common Boolean functions are AND, OR and NOT.