a letter of application
I've sent off applications for four different jobs.
Have you filled in the application form for your passport yet?
After having filled [in] the application form, the master pilot took us on a short trip around the hangars showing the planes used for training. (Preliminary English Test; B1; Italian)
Typical examples of software applications are spreadsheets, media players and database applications.
I am [an] exp[e]rienced user of [the] Internet and know all application programs for Windows '95 (Word, Excel, PowerPoint, PinPoint etc). (First Certificate in English; B2; Russian)
This technology has many practical applications.
We have been working [o]n the growing of cells in zero-gravity environments, having in mind its possible application in outer space colonies, such as the International Space Station. (Certificate of Proficiency in English; C2; Spanish)