Noun
supervaluationism (uncountable)
(logic) A semantics for dealing with irreferential singular terms and vagueness.
"Truth, belief and vagueness", in Journal of Philosophical Logic Vol. 5. pp. 47-78 and Dorothy Edgington (1993). citation Supervaluationism main Another theoretical approach is known as "supervaluationism". Source: Internet
Since the presence of borderline cases seems to threaten principles like this one (excluded middle), the fact that supervaluationism can "rescue" them is seen as a virtue. Source: Internet