Webster's English Dictionary

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certify

Cross references:
  1. approve               
 
cer.ti.fy \'s*rt-*-.fi-\ vt [ME certifien, fr. MF certifier, fr. LL 
   certificare, fr. L Xcertus certain 1: to attest authoritatively : as  1a: 
   CONFIRM  1b: to present in formal communication  1c: to attest as being 
   true or as represented or as meeting a standard  1d: to attest officially 
   to the insanity of  2: to inform with certainty  3: to guarantee (a 
   personal check) as to signature and amount by so indica ting on the face 4: 
   CERTIFICATE, LICENSE