affirm

verb

Definitions of affirm

to confirm that a statement or fact is true

The two Governments affirm their solemn commitment to support, and where appropriate implement, the provisions of the Multi-Party Agreement.

to make a solemn declaration in place of an oath (=a promise that that a person will tell the truth (especially in a court of law), especially one that makes reference to God or to a holy book) by a person who objects to taking an oath for reasons of conscience

The witness chose to affirm rather than swear on a religious text such as the Koran or the Bible.

to officially say that a judgment, decree, or order etc is valid (=acceptable and will be upheld)

The court of appeal affirmed the judgment of the lower court.