Definitions from Wiktionary ( )

▸ noun:  A separation or division into two; a distinction that results in such a division.
▸ noun:  Such a division involving apparently incompatible or opposite principles; a duality.
▸ noun:  (logic) The division of a class into two disjoint subclasses that are together comprehensive, as the division of human into female and male.
▸ noun:  (biology, taxonomy) The division of a genus into two species; a division into two subordinate parts.
▸ noun:  (astronomy) A phase of the moon when it appears half lit and half dark, for example at the quadratures.
▸ noun:  (botany) Division and subdivision; bifurcation, such as that of a stem of a plant or a vein of the body into two parts as it proceeds from its origin; often successive.

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