Webster's English Dictionary

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affirm

Cross references:
  1. assert                
 
af.firm \*-'f*rm\ \*-'f*r-m*-b*l\ \*-'f*r-m*n(t)s\ vb [ME affermen, fr. MF 
   afermer, fr. L affirmare, fr. ad-]+ firmare to make firm, fr. firmus firm - 
   more at FIRM 1a: VALIDATE, CONFIRM  1b: to assert as valid or confirmed  1: 
   to testify or declare by affirmation  2: to uphold a judgment or decree of 
   a lower court  - af.firm.able aj