What is function?

function meaning (1) (ISO) A mathematical entity whose value, namely, the value of the dependent variable, depends in a specified manner on the values of one or more independent variables, with not more than one value of the dependent variable corresponding to each permissible combination of values from the respective ranges of the independent variables. (2) A specific purpose of an entity, or its characteristic action. (3) In data communication, a machine action such as carriage return or line feed.


reference: U.S . Food & Drug – Glossary of Computer System Software Development Terminology (8/95)