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18. Thought / C. Content / 8. Intension

[way a set of things is conceived]

5 ideas
Extension is the class of things, intension is the correct definition of the thing, and intension determines extension [Lewis,CI]
The intension of an expression is a function from possible worlds to an appropriate extension [Perry]
The intension of "lemon" is the conjunction of properties associated with it [Schwartz,SP]
In intensional contexts, truth depends on how extensions are conceived. [Crane]
Intensions are functions which map possible worlds to sets of things denoted by an expression [Swoyer]