Intention

The word intention admits a variety of meanings:

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• Purpose is thoughtful and deliberate goal-directedness -- thus "intentional" behavior. Intention to commit a crime is sometimes a crime by itself, see grooming a child.
• In the philosophy of mind, intentionality is "aboutness", i.e. an intentional state of mind is one that is "about" something -- i.e. has some subject matter. Intention directs all the forces of the psyche.
• Intension (with an s) is a different word easily mistaken for intention (with a t).