Full Idea
Intensional contexts are those where truth or falsehood depends on the way the extensions are conceived.
Clarification
Extensions of a concept are things in reality which it picks out
Gist of Idea
In intensional contexts, truth depends on how extensions are conceived.
Source
Tim Crane (Elements of Mind [2001], 1.4)
Book Reference
Crane,Tim: 'Elements of Mind' [OUP 2001], p.11
A Reaction
An important distinction for anyone defending an internalist view of concepts or of knowledge