Definition of shires:
(n) :
(British) (chiefly historical) An administrative area or district between about the 5th to the 11th century, subdivided into hundreds or wapentakes and jointly governed by an ealdorman and a sheriff; also, a present-day area corresponding to such a historical district; a county; especially (England), a county having a name ending in -shire.
(n) :
(by extension) An administrative area or district in other countries.
(n) :
(Australia, often attributive) An outer suburban or rural local government area which elects its own council.
(n) :
(British) (by extension) The people living in a shire (noun, sense 1.1) considered collectively.
(n) :
(British) (by extension, informal) The general area in which a person comes from or lives.
(v) :
(transitive) To constitute or reconstitute (a country or region) into one or more shires (noun noun, sense 1.1) or counties.