View your list of saved words. (You can log in using Facebook.)
Psychological state expressed by a verb that may take a subordinate clause beginning with that as its complement. Verbs such as believe, hope, fear, desire, intend, and know all express propositional attitudes. The linguistic contexts created by their use are typically referentially opaque (seeintentionality) in the sense that the substitution of co-referential expressions within them may change the truth value (true or false) of the containing sentence. Thus, to use Bertrand Russell's example, though it is true that Peter believes that Walter Scott was a Scotsman, it may be false that he believes that the author of Waverley (who is Scott) was a Scotsman.
This entry comes from Encyclopædia Britannica Concise. For the full entry on propositional attitude, visit Britannica.com.
Seen & Heard
What made you look up propositional attitude? Please tell us what you were reading, watching or discussing that led you here.