Webster's English Dictionary

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expert

Cross references:
  1. proficient            
 
1. ex.pert \'ek-.sp*rt, ik-'\ aj [ME, fr. MF & L; MF, fr. L expertus, fr. 
   pp. of experiri] obs  1: EXPERIENCED  2: having, involving, or displaying 
   special skill or knowledge derived fro m training or experience - 
   ex.pert.ly av
2. ex.pert \'ek-.sp*rt\ n [F, fr. expert, adj] : one who has acquired 
   special skill in or knowledge of a particular subje ct : AUTHORITY
3. ex.pert \'ek-.sp*rt\ vt : to serve as an expert for  : to serve as an 
   expert