Scandinavian country from Dane, the people's name, + Danish mark "border" (see mark (n.1)). The modern form is attested from late 14c. (from earlier Denemarke, c. 1200, from Old English Dene-mearce), but originally it meant western Scandinavia generally, "the lands of the Danes and Northmen." As an adjective, Middle English had Dene-marchish.

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Definitions of Denmark from WordNet

Denmark (n.)
a constitutional monarchy in northern Europe; consists of the mainland of Jutland and many islands between the North Sea and the Baltic Sea;
Synonyms: Kingdom of Denmark / Danmark