Definitions
1.nounA separation or division into two; a distinction that results in such a division.
2.nounSuch a division involving apparently incompatible or opposite principles; a duality.
3.nounThe division of a class into two disjoint subclasses that are together comprehensive, as the division of man into white and not white.
4.nounThe division of a genus into two species; a division into two subordinate parts.
5.nounA phase of the moon when it appears half lit and half dark, as at the quadratures.
6.nounDivision and subdivision; bifurcation, as of a stem of a plant or a vein of the body into two parts as it proceeds from its origin; often successive.