What is Ground?

Legal Definition
1. Soil; earth; a portion of the earth's surface appropriated to private use and under cultivation or susceptible of cultivation. Though this term is sometimes used in conveyances and in statutes as equivalent to "land," it is properly of a more limited signification, because it applies strictly only to the surface, while "land" includes everything beneath the surface, and because "ground" always means dry land, whereas "land" may and often does include the beds of lakes and streams and other surfaces under water. See Wood v. Carter, 70 III. App. 218; State v. Jersey City, 25 N. J. Law, 529; Co.m. v. Roxbury, 9 Gray (Mass.) 491.
See also
-- Black's Law Dictionary