Duality
Part of speech: noun
Definition: A classification into two subclasses or opposed parts. The interchangeability of points and planes. The mathematical equivalence of two seemingly different theoretical descriptions of a physical system.
Example sentence: Well I think that the mind of a serial killer and the mind of the detectives represent the duality we face as people.
Dichotomy
Part of speech: noun
Definition: A cutting in two; a division.Division or distribution of genera into two species; division into two subordinate parts.The phase of the moon in which it appears bisected, or shows only half its disk, as at the quadratures.Successive division and subdivision, as of a stem of a plant or a vein of the body, into two parts as it proceeds from its origin; successive bifurcation.The place where a stem or vein is forked.Division into two; especially, the division of a class into two subclasses opposed to each other by contradiction, as the division of the term man into white and not white.conditions perceived as polar extremes or oppositesan either-or perspective
Example sentence: It's interesting, because in the corporate stuff there's a dichotomy there, depending on the creator. Even what, in essence, may be a very safe corporate approach, there is some stuff that is allowed to be pushed.