Definition of affirm verb from the Oxford Advanced Learner's Dictionary

 

affirm

 verb
verb
BrE BrE//əˈfɜːm//
 
; NAmE NAmE//əˈfɜːrm//
 
(formal)Verb Forms present simple I / you / we / they affirm
BrE BrE//əˈfɜːm//
 
; NAmE NAmE//əˈfɜːrm//
 
he / she / it affirms
BrE BrE//əˈfɜːmz//
 
; NAmE NAmE//əˈfɜːrmz//
 
past simple affirmed
BrE BrE//əˈfɜːmd//
 
; NAmE NAmE//əˈfɜːrmd//
 
past participle affirmed
BrE BrE//əˈfɜːmd//
 
; NAmE NAmE//əˈfɜːrmd//
 
-ing form affirming
BrE BrE//əˈfɜːmɪŋ//
 
; NAmE NAmE//əˈfɜːrmɪŋ//
 
 
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to state firmly or publicly that something is true or that you support something strongly synonym confirm affirm something Both sides affirmed their commitment to the ceasefire. The decision was affirmed by the Court of Appeal. affirm that… I can affirm that no one will lose their job. Word Origin Middle English (in the sense ‘make firm’): via Old French from Latin affirmare, from ad- ‘to’ + firmus ‘strong’.
See the Oxford Advanced American Dictionary entry: affirm