Legal Dictionary

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Affirm

To affirm is to solemnly declare the truth of a matter, or an ability to testify truthfully. An affirmation is given in the place of an oath when the witness has some objection to taking an oath, for example, a Jehovah's Witness would make an affirmation as opposed to solemnly swearing to tell the truth, the whole truth and nothing but the truth. Affirming and swearing have the same legal effect. So a person who lies on the stand after affirming that they would tell the truth would perjure him or herself.

See also, Affirmation.