tristate

Adjective

 * 1) Having, or pertaining to, three distinct states.
 * This tristate logic deals with true, false, and unknown values.
 * Of, pertaining to, or characteristic of a region in the United States where three state borders come to a single point.
 * The event will be sponsored by several tristate businesses.

Noun

 * 1)  A variable, etc. that can take any of three distinct values.
 * 2)  The area in some regions of the United States where three state borders come to a single point.
 * The Tristate is on alert after a rash of home burglaries.
 * 1)  The area in some regions of the United States where three state borders come to a single point.
 * The Tristate is on alert after a rash of home burglaries.