definite and definitive - the difference


 
Definite means known for certain.
Definitive means conclusive.
 

Definite

The adjective definite means known for certain or precise.

Examples:

Is it definite that the plane has left?

I can't make sense of your invoices. I need to know the definite amount.

Definitive

The adjective definitive means conclusive or authoritative

Examples:

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.
 

See also:

What are adjectives?
What are verbs?
List of easily confused words