From WordNet (r) 3.0 (2006) :
Boolean
adj 1: of or relating to a combinatorial system devised by
George Boole that combines propositions with the logical
operators AND and OR and IF THEN and EXCEPT and NOT
From The Free On-line Dictionary of Computing (30 December 2018) :
Boolean
bool
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.
(1997-12-01)