n The act of applying or laying on, in a literal sense; as, the application of emollients to a diseased limb.
n The act of directing or referring something to a particular case, to discover or illustrate agreement or disagreement, fitness, or correspondence.
n (computing) A computer program or the set of software that the end user perceives as a single entity as a tool for a well-defined purpose. (Also called: application program; application software.)