HMS Dreadnought was a Royal Navy battleship that revolutionised naval power. Her name and the type of the entire class of warships that was named after her stems from archaic English in which "dreadnought" means "a fearless person". Dreadnought's entry into service in 1906 represented such an advance in naval technology that its name came to be associated with an entire generation of battleships, the "dreadnoughts", as well as the class of ships named after it. Likewise, the generation of ships she made obsolete became known as "pre-dreadnoughts". Admiral Sir John "Jacky" Fisher, First Sea Lord of the Board of Admiralty, is credited as the father of Dreadnought. Shortly after he assumed office, he ordered design studies for a battleship armed solely with 12-inch (305 mm) guns and a speed of 21 knots. He convened a "Committee on Designs" to evaluate the alternative designs and to assist in the detailed design work. One ancillary benefit of the Committee was that it would shield him and the Admiralty from political charges that they had not consulted leading experts before designing such a radically different battleship.