<p><strong>Verb (used with object)</strong></p><ul><li>to establish the truth, accuracy, validity, or genuineness of; corroborate; verify: This report confirms my suspicions.</li><li>Synonyms: validate, authenticate, substantiate, prove</li><li>Antonyms: disprove</li><li>to acknowledge with definite assurance: Did the hotel confirm our room reservation?</li><li>to make valid or binding by some formal or legal act; sanction; ratify: to confirm a treaty; to confirm her appointment to the Supreme Court.</li><li>Antonyms: invalidate</li><li>to make firm or more firm; add strength to; settle or establish firmly: Their support confirmed my determination to run for mayor.</li><li>Synonyms: fix</li><li>Antonyms: shake</li><li>to strengthen (a person) in habit, resolution, opinion, etc.: The accident confirmed him in his fear of driving.</li><li>to administer the religious rite of confirmation to.</li></ul>