## FUNCTION

### Function

In mathematics, a function is a relation between a set of inputs and a set of permissible outputs with the property that each input is related to exactly one output. An example is the function that relates each real number x to its square x2. The output of a function f corresponding to an input x is denoted by f . In this example, if the input is −3, then the output is 9, and we may write f = 9. The input variable are sometimes referred to as the argument of the function.

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### function

#### Noun

1. What something does or is used for.
2. A professional or official position.
3. An official or social occasion.
4. A relation where one thing is dependent on another for its existence, value, or significance.
5. A relation in which each element of the domain is associated with exactly one element of the codomain.
6. A routine that receives zero or more arguments and may return a result.
7. The physiological activity of an organ or body part.
8. The characteristic behavior of a chemical compound.
9. The role of a social practice in the continued existence of the group.

#### Verb

1. to have a function
2. to carry on a function; to be in action

The above text is a snippet from Wiktionary: function
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