Magna Carta

also Magna Charta, 1560s, Medieval Latin, literally "great charter" (of English personal and political liberty). The thing was obtained from King John, June 15, 1215; the name is attested in Anglo-Latin by 1218. See magnate, card (n.).

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Definitions of Magna Carta from WordNet

Magna Carta (n.)
the royal charter of political rights given to rebellious English barons by King John in 1215;
Synonyms: Magna Charta / The Great Charter