Webster's English Dictionary

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convince

con.vince \k*n-'vin(t)s\ vt [L convincere to refute, convict, prove, fr. 
   com- + vincere t]o conquer obs  1a: to overcome by argument  obs  1b: 
   OVERPOWER, OVERCOME  obs  2: DEMONSTRATE, PROVE  3: to bring by argument to 
   assent or belief  - con.vinc.er n