The words 'intension' and 'extension' are
| also used in connection with a number of distinctions related
| or analogous to this one, the adjective 'extensional' being
| applied to notions or points of view which in some respect
| confine attention to truth-values of propositions as
| opposed to meanings constituting propositions.
| In the case of (interpreted) calculi of
| propositions or propositional functions,
| the adjective 'intensional' may mean
| that account is taken of modality,
| 'extensional' th