|Origin:||afermer, from Latin affirmare, from ad- 'to' + firmare 'to make firm'|
af‧firm [transitive] formal
to state publicly that something is true [= confirm]:
The general affirmed rumors of an attack.
A spokesman for the company affirmed that a merger was likely.
to strengthen a feeling, belief, or idea:
He claims that modern physics affirms his Christian beliefs.
—affirmation noun [uncountable and countable]