Purpose is...

...The original intent for the creation of a thing
...The original reason for the existence of a thing
...The cause for the creation of a thing
...The desired result that initiates production
...The need that makes a manufacturer produce a specific product
...The destination that prompts the journey
...The expectation of the source
...The objective of the subject
...The aspiration for the inspiration, and
...The object one wills or resolves to have.