A continent (the third largest) in the western hemisphere connected to South America by the Isthmus of Panama WordNet 3.0 & Open English WordNet

North America is a continent in the Northern and Western Hemispheres. Wikipedia

Continent Wikidata

Wikimedia permanent duplicate item Wikidata

A continent in the northern half of the western hemisphere, bounded by the Arctic Ocean in the north, by the Pacific Ocean and the Bering Sea in the west, and by the Atlantic Ocean and the Gulf of Mexico in the east, connected to South America by the Isthmus of Panama, and including the United States, Canada, Mexico and several small island nations. OmegaWiki

The continent that is the northern part of the Americas; that part east of the Pacific Ocean, west of the Atlantic Ocean, north of South America and south of the Arctic Ocean. Wiktionary

Continent. Wiktionary (translation)