division into two parts, kinds, etc.; subdivision into halves or pairs.

division into two mutually exclusive, opposed, or contradictory groups

a dichotomy between thought and action.

Botany . a mode of branching by constant forking, as in some stems, in veins of leaves, etc.

Astronomy . the phase of the moon or of an inferior planet when half of its disk is visible.

noun

difference , difference of opinion , disagreement , disunion , separation , split