Question

application
ap·pli·ca·tion
 /ˌæpləˈkeıʃən/  noun  ,  pl   -tions
  1 a : a formal and usually written request for something (such as a job, admission to a school, a loan, etc.)
   [  count  ] We've made an application for certification. [=we have applied to be certified]
    Our loan application has been approved/denied.
    Anyone interested in running for office must file/submit an application by August 1st.
   [  noncount  ] If you'd like to be considered for the job, please send us a letter of application that gives your experience and qualifications.
  1 b [  count  ] : a document that is used to make a formal request for something
   Please fill out this application.
  2 : the act of applying something: such as
  2 a : the act of putting something on a surface, a part of the body, etc.
   [  noncount  ] The application of heat often helps sore muscles.
    I prefer using the lotion because of its ease of application. [=because it is easy to apply]
    Repeated application of fertilizer will help the grass become green and healthy.
   [  count  ] Repeated applications of fertilizer will help the grass become green and healthy.
    The cut should be treated with a generous/liberal application of ointment.
  2 b : the use of an idea, method, law, etc., in a particular situation or for a particular purpose
   [  noncount  ] Strict application of the rules is necessary in this case.
    the application of new information
    learning about the creative application [=use] of new technology
   [  count  ] He teaches his students about the practical applications [=uses] of technology.
    I think it is a fair application of the law.
    applications of science to everyday life
  2 c [  noncount  ] : the use of a word, name, etc., to describe someone or something
   the application of the term “baby boomer” to people who were born right after World War II
  3 : the ability to be used for practical purposes
   [  noncount  ] The technique has wide/limited application. [=it can/cannot be used for a large number of practical purposes]
   [  count  ] The tool has a number of applications. = The tool has a wide range of applications.
  4 [  count  ] computers : a computer program that performs a particular task (such as word processing)
   How many applications is your computer currently running?
   applications software
  — called also (chiefly US, informal) app
  5 [  noncount  ] formal : effort made to work hard in order to complete something successfully
   She succeeded because of application and intelligence.