Delaware2Pronunciation: /ˈdɛləwɛː/Definition of Delaware noun (plural same or Delawares) 1a member of an American Indian people formerly inhabiting the Delaware River valley of New Jersey and eastern Pennsylvania. 2 [mass noun] either of two Algonquian languages (Munsi and Unami), both now extinct, spoken by the Delaware. adjective relating to the Delaware or their languages. Origin:named after the River Delaware (see Delaware1)Delaware in other Oxford dictionaries Definition of Delaware in the US English dictionary