dichotomy
Pronunciation:
/daɪˈkɒt.ə.mi/noun
Definitions
A separation or division into two; a distinction that results in such a division.
Such a division involving apparently incompatible or opposite principles; a duality.
The division of a class into two disjoint subclasses that are together comprehensive, as the division of man into white and not white.
The division of a genus into two species; a division into two subordinate parts.