The motion of an object in or through a medium, especially through the earth's atmosphere or through space. An instance of such motion. The distance covered in such motion. The act or process of flying through the air by means of wings. The ability to fly. A swift passage or movement. A scheduled airline run or trip. A group, especially of birds or aircraft, flying together. See Synonyms at flock1. A number of aircraft in the U.S. Air Force forming a subdivision of a squadron. A round of competition, as in a sports tournament. An exuberant or transcendent effort or display: a flight of the imagination; flights of oratory. A series of stairs rising from one landing to another. To migrate or fly in flocks. The act or an instance of running away; an escape.