Boo·le·an /ˈbuːliən/ adjective [only before noun] technical
a Boolean system is based on things that can be either true or false, but not both. It links statements with words called operators, such as AND, OR, and NOT. Boolean systems are used to write computer programs, especially Internet search programs:
The program searches for information using Boolean logic.

[TahlilGaran] Dictionary of Contemporary English ▲