trichotomy
/tɹaɪˈkɒt.ə.mi/noun
University
1
Division or separation into three groups or pieces.
2
the property of an order relation whereby, given an ordered pair of elements (of a given algebraic structure), exactly one of these is true: the first element is 'less than' the second one, the second is 'less than' the first, or the two elements are equal.
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