Do you speak of mutually exclusive terminology and contradictory definitions, or only of mutually exclusive possibilities within the physical universe?
I suppose I would speak first and foremost of "pure logical," purely formal, forms of contradiction, "conceptual" contradicton. I'm inclined to think of it as more fundamental than that of mutually exclusive possibilities in the physical universe (or at least, equally fundamental to those in the physical universe (presuming here that the distinction between "formal" and "physical" is itself an ultimately legitimate one...))