St. Martin's Le Grand is a former liberty within the City of London, and is the name of a street north of Newgate Street and Cheapside and south of Aldersgate Street. It forms the southernmost section of the A1 road.[2] For many years St. Martin's Le Grand was "often used as a synonym for the chief postal authorities, as Scotland Yard is used to designate the police",[3] the headquarters of the General Post Office having been there from 1829-1984.
Webster1974
was invoked but never defined (see the help page).