But all these types of research cannot provide definite proof that a particular treatment works.

"Let us say that I shall have definite proof in my hands tomorrow."

This is definite proof that each member who signs up makes a difference.

We know what she's been up to, but we've got no definite proof of it.

They still had no definite proof of the skeleton's identity.

It wouldn't hurt to alert the police, although I have no definite proof at this time.

"It may be that I can offer you definite proof."

If she ever gets definite proof, I suppose she'll throw him out.

He wanted definite proof that Hitler was dead before deciding what to do.

The screams of the young one were definite proof that it was still very much alive.