Definition of function noun from the Oxford Advanced American Dictionary

        

    function

     noun
    noun
    NAmE//ˈfʌŋkʃn//
     
     
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  1. 1 [countable, uncountable] a special activity or purpose of a person or thing to fulfill/perform a function bodily functions (= for example eating, sex, going to the bathroom) The function of the heart is to pump blood through the body. This design aims for harmony of form and function.
  2. 2[countable] a social event or official ceremony The hall provided a venue for weddings and other functions. There are numerous functions in aid of charity.
  3. 3 [countable] (mathematics) a quantity whose value depends on the varying values of others. In the statement 2x = y, y is a function of x (figurative) Salary is a function of age and experience.
  4. 4[countable] (computing) a part of a program, etc. that performs a basic operation
See the Oxford Advanced Learner's Dictionary entry: function