Definition of application

• a verbal or written request for assistance or employment or admission to a school; "December 31 is the deadline for applications"
• the act of bringing something to bear; using it for a particular purpose; "he advocated the application of statistics to the problem"; "a novel application of electronics to medical diagnosis"
• a program that gives a computer instructions that provide the user with tools to accomplish a task; "he has tried several different word processing applications"