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English definition of “affirm”

affirm

verb  /əˈfɜrm/ us  
to state something is true, or to state your support for an idea, opinion, etc.: [T] Applicants signed a form affirming their citizenship. [+ that clause] These stories affirmed that the world is strange.
affirmation
noun [C/U]  /ˌæf·ərˈmeɪ·ʃən/ us  
[U] We’re looking for affirmation of the city’s goal.
(Definition of affirm from the Cambridge Academic Content Dictionary © Cambridge University Press)
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