n. (Computers) The execution of low priority programs while higher priority programs are not using the processing system. Syn. -- background processing [ WordNet 1.5 ]
n. 1. The act, method, or process of laying a groundwork or foundation. [ 1913 Webster ]
2. Hence: [ Nominalized form of ground{ 3 }, v. t. ] Elementary instruction; instruction in the basic concepts of a topic or skill. [ PJC ]
3. The act or process of applying a ground, as of color, to wall paper, cotton cloth, etc.; a basis. [ 1913 Webster ]