v.
   - establish the truth or correctness of. 
▸state with assurance that something is true.
 ▸
(confirm someone in)
 reinforce someone in (an opinion or feeling).
 - make (a provisional arrangement) definite. 
▸formally declare that (someone) is appointed to a post.
 - administer the religious rite of confirmation to.
 
 
  Derivative
  
    - confirmative adj.
  - confirmatory adj.
 
   
  Etymology
  ME: from OFr. confermer, from L. confirmare, from con- ‘together’ + firmare ‘strengthen’ (from firmus ‘firm’).