CONFIRMED definition: 1. used to say that someone has had a particular habit or way of life for a long time and is…. Learn more. Learn the correct usage of "I confirmed" and "I confirm" in English. Discover differences, examples, alternatives and tips for choosing the right phrase. Confirmed definition: made certain as to truth, accuracy, validity, availability, etc.: confirmed reservations on the three o'clock flight to Denver.. See examples of CONFIRMED used in a sentence. Learn the correct usage of "confirmed" and "confirm" in English. Discover differences, examples, alternatives and tips for choosing the right phrase.