Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: Old French
Origin: afermer, from Latin affirmare, from ad- 'to' + firmare 'to make firm'

affirm

 verb
     
af‧firm [transitive] formal
1 to state publicly that something is true [= confirm]:
The general affirmed rumors of an attack.
affirm that
A spokesman for the company affirmed that a merger was likely.
2 to strengthen a feeling, belief, or idea:
He claims that modern physics affirms his Christian beliefs.
—affirmation noun [uncountable and countable]
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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