'Yankee' definitions:

Definition of 'Yankee'

adjective

Used by Southerners for an inhabitant of a northern state in the United States (especially a Union soldier)

noun

An American who lives in the North (especially during the American Civil War) [syn: Yankee, Yank, Northerner]

noun

An American who lives in New England [syn: New Englander, Yankee]

noun

An American (especially to non-Americans) [syn: Yankee, Yank, Yankee-Doodle]

From: GCIDE

Yankee \Yan"kee\, n. [Commonly considered to be a corrupt pronunciation of the word English, or of the French word Anglais, by the native Indians of America. According to Thierry, a corruption of Jankin, a diminutive of John, and a nickname given to the English colonists of Connecticut by the Dutch settlers of New York. Dr. W. Gordon ("Hist. of the Amer. War," ed, 1789, vol. i., pp. 324, 325) says it was a favorite cant word in Cambridge, Mass., as early as 1713, and that it meant excellent; as, a yankee good horse, yankee good cider, etc. Cf. Scot yankie a sharp, clever, and rather bold woman, and Prov. E. bow-yankees a kind of leggins worn by agricultural laborers.] A nickname for a native or citizen of New England, especially one descended from old New England stock; by extension, an inhabitant of the Northern States as distinguished from a Southerner; also, applied sometimes by foreigners to any inhabitant of the United States. [1913 Webster]
From meanness first this Portsmouth Yankey rose, And still to meanness all his conduct flows. --Oppression, A poem by an American (Boston, 1765). [1913 Webster]

From: GCIDE

Yankee \Yan"kee\, a. Of or pertaining to a Yankee; characteristic of the Yankees. [1913 Webster]
The alertness of the Yankee aspect. --Hawthorne. [1913 Webster]
Yankee clover. (Bot.) See Japan clover, under Japan. [1913 Webster]