From BiblePortal Wikipedia

King James Dictionary [1]

CONFIRM, L., to make firm. See Firm.

1. To make firm, or more firm to add strength to to strengthen as, health is confirmed by exercise. 2. To fix more firmly to settle or establish.

Confirming the souls of the disciples.  Acts 14 .

I confirm thee in the priesthood. Maccabees.

Confirm the crown to me and to mine heirs.

3. To make firm or certain to give new assurance of truth or certainty to put past doubt.

The testimony of Christ was confirmed in you.  1 Corinthians 1 .

4. To fix to radicate as, the patient has a confirmed dropsy. 5. To strengthen to ratify as, to confirm an agreement, promise, covenant or title. 6. To make more firm to strengthen as, to confirm an opinion, a purpose or resolution. 7. To admit to the full privileges of a Christian, by the imposition of hands.

Holman Bible Dictionary [2]

 Deuteronomy 27:26 Leviticus 26:9 2 Samuel 7:25 1 Chronicles 16:17 Isaiah 44:26 Romans 15:8 Ruth 4:7 1 Kings 1:14 Esther 9:29 Jeremiah 44:25 Hebrews 6:16 2 Kings 15:19 1 Chronicles 17:14 1 Corinthians 1:6 Philippians 1:7 2 Peter 1:10

Webster's Dictionary [3]

(1): (v. t.) To render valid by formal assent; to complete by a necessary sanction; to ratify; as, to confirm the appoinment of an official; the Senate confirms a treaty.

(2): (v. t.) To make firm or firmer; to add strength to; to establish; as, health is confirmed by exercise.

(3): (v. t.) To administer the rite of confirmation to. See Confirmation, 3.

(4): (v. t.) To strengthen in judgment or purpose.

(5): (v. t.) To give new assurance of the truth of; to render certain; to verify; to corroborate; as, to confirm a rumor.