trichotomous

== English == === Etymology === From trichotomy +‎ -ous. Modelled on dichotomous. === Adjective === trichotomous (not comparable) Divided into three parts, or into threes; forking three ways. (set theory) 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.