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attest  vb 
1 to affirm the correctness or truth of 
2 to witness (an act, event, etc.) or bear witness to (an act, event, etc.) as by signature or oath 
3 to make evident; demonstrate 
his life of luxury attests his wealth  
4 to provide evidence for 
the marks in the ground attested the presence of a fossil  
  (C16: from Latin attestari to prove, from testari to bear witness, from testis a witness) 
 attestable  adj 
 attestant, attester  (esp. in legal usage) 
 attestor, attestator  n 
 attestation  n