Boolean

Etymology
From the name of George Boole.

Adjective

 * 1) Of or pertaining to the work of George Boole.
 * 2)  Pertaining to data items that can have “true” and “false” (or, equivalently, 1 and 0 respectively) as their only possible values and to operations on such values.

Derived terms

 * Boolean algebra
 * Boolean function
 * Boolean logic
 * Boolean ring
 * Boolean variable

Noun

 * 1)  A variable that can hold a single true/false (1/0) value.

Synonyms

 * flag