early 15c., "assertion that something is true," from Old French afermacion (14c.), from Latin affirmationem (nominative affirmatio) "an affirmation, solid assurance," noun of action from past participle stem of affirmare (see affirm). In law, as the Quaker alternative to oath-taking, it is attested from 1690s.
1. The ministers issued an affirmation of their faith in the system.
2. The Director is awaiting the Board's affirmation of his nominee.
3. A single nod implies an affirmation.
4. The high turnout was an affirmation of the importance that the voters attached to the election.
5. When sitting for that Purpose, they shall be on Oath or Affirmation.