application

Sustained effort or diligence in study or work.

"She showed great application to her academic pursuits."

A computer program designed for a specific function or task.

"Download the new mobile application to your phone."

The act of putting or spreading something onto a surface.

"Careful application of the cream soothed her skin."

The practical use or relevance of a theory or idea.

"This scientific principle has many real-world applications."

A formal request, usually written, for something specific.

"His application for the university course was successful."