n. A flag; an ensign; especially, in Europe in the middle ages, the flap; of the knight bachelor, or knight who had not yet reached the dignity of banneret. It is usually described as being pointed at the fly, but the swallow-tail flag is also described as a pennon.n. In heraldry, in modern ceremonial, as at funerals, a long and narrow flag, usually from four to five feet long, on which are depicted the owner's arms or a part of them, as the crest and motto.n. A pinion; a wing.