Intensionalism

The first step in showing the irrelevance of Mates's problem is to separate Frege's intensionalism from intensionalism per se .

Source: wiktionary

Intensionalism in modern logic and linguistics begins in the way he demonstrated the point. For as "the Morning Star" and "the Evening Star" have different senses—i.e., objective linguistic content—so do statements.

Source: wiktionary

It is sometimes supposed that extensional propositions—in particular Russellian propositions, which are adopted in some neo-Millian views about proper names—are incompatible with intensionalism and presuppositionalism.

Source: wiktionary