She knew from a young age that her sole 'purpose' (in life) was to be a writer. [=she knew that all she wanted (in life) was to be a writer]
We were happy to know that the money was being used 'for a good purpose'. [=for something useful, important, etc.]
There's little/no 'purpose' in restarting the process. [=there is little/no reason to start the process again]
(..) - What kind of license? A license that permits the playing of any musical instrument... in a public place for the purpose of commercial enterprise. Commercial enterprise? Yes. You play that thing and people give you the money. People give the monkey the money. - It is the same. (..)1975 The Return of the Pink Panther
(..) Monsieur? City ordinance B prohibits the playing... of any musical instrument in a public place... for the purpose of commercial enterprise without a license. - I don't understand. - It is against the "leau"... - for you to play your musical instrument. - The "leau"? (..)1975 The Return of the Pink Panther