affirm

verb

• To agree, verify or concur; to answer positively.

  "She affirmed that she would go when I asked her."

• To assert positively; to tell with confidence; to aver; to maintain as true.
• To support or encourage.

  "They did everything they could to affirm the children's self-confidence."

• To make firm; to confirm, or ratify; especially to assert or confirm, as a judgment, decree, or order, brought before an appellate court for review.