trichotomous

/T R AY0 K AA1 T AH0 M AH0 S/
adjective
  1. 1

    Divided into three parts, or into threes; forking three ways.

  2. 2

    (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.