Application

Noun

1. The act of physically applying or laying on.

   "The application of this cream should reduce the swelling."

2. The substance applied.
3. The act of applying as a means; the employment of means to accomplish an end; specific use.
4. The act of directing or referring something to a particular case, to discover or illustrate agreement or disagreement, fitness, or correspondence.

   "I make the remark, and leave you to make the application."

5. 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.)

   "This application can connect to most social networks."