A separation or division into two; a distinction that results in such a division.
The division of a genus into two species; a division into two subordinate parts.
A phase of the moon when it appears half lit and half dark, as at the quadratures.
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.
Division 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.
Division or separation into three groups or pieces.
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.