Webster's English Dictionary

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authenticate

Cross references:
  1. confirm               
 
au.then.ti.cate \*-'thent-i-.ka-t, o.-\ \*-.thent-i-'ka--sh*n, (.)o.-\ 
   \*-'thent-i-.ka-t-*r, o.-\ vt : to prove the authenticity of  - 
   au.then.ti.ca.tion n