The Collaborative International Dictionary of English v.0.48:

Preve \Preve\, v. i. & i.
   To prove. [Obs.] --Chaucer.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Preve \Preve\, n.
   Proof. [Obs.] --Chaucer.
   [1913 Webster]