The act of applying. Something applied, such as a cosmetic or curative agent. The act of putting something to a special use or purpose: an application of a new method. A specific use to which something is put: the application of science to industry. The capacity of being usable; relevance: Geometry has practical application in aviation and navigation. Close attention; diligence: shows application to her work. A request, as for assistance, employment, or admission to a school. The form or document on which such a request is made. Computers A computer program designed for a specific task or use.