certification in WordNet English dictionary

1. validating the authenticity of something or someone
   authentication  certification 
   
2. a document attesting to the truth of certain stated facts
   certificate  certification  credential  credentials 
   
3. the act of certifying or bestowing a franchise on
   certification  enfranchisement 
   
4. confirmation that some fact or statement is true through the use of documentary evidence
   documentation  certification  corroboration