Definite means known for certain.|
Definitive means conclusive.
DefiniteThe adjective definite means known for certain or precise.
Is it definite that the plane has left?
I can't make sense of your invoices. I need to know the definite amount.
DefinitiveThe adjective definitive means conclusive or authoritative
This is the definitive paper on the company's holdings.
Was that the judge's definitive verdict?
DEFINITELY NOT DEFINATE
There is no such word as definate, which is a very common misspelling of definite. Definately does not exist either.