trichotomous

Etymology
. Modelled on.

Adjective

 * 1) Divided into three parts, or into threes; forking three ways.
 * 2)  Such that, for all x and y in X, and for a binary relation R, exactly one of xRy, yRx or x=y holds.
 * > is a trichotomous relation, while the relation "divides" over the natural numbers is not.
 * > is a trichotomous relation, while the relation "divides" over the natural numbers is not.