Dreadnought meaning : A battleship, especially of the World War I era, in which most of the firepower is concentrated in large guns that are of the same caliber. A type of warship heavier in armour or armament than a typical battleship One that is the largest or the most powerful of its kind. A garment made of thick woollen cloth that can defend against storm and cold. The cloth itself; fearnaught. A person who fears nothing. Something that assures against fear.