# What Is the Definition of a Function?

A function is defined as an activity or purpose natural to or intended for a person or thing. Alternatively, it is used in mathematics to refer to a relation between a set of inputs and a set of potential outputs with the property that each input is related to exactly one output.
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func·tion
[fuhngk-shuhn]
NOUN
1.
the kind of action or activity proper to a person, thing, or institution; the purpose for which something is designed or exists; role.
2.
any ceremonious public or social gathering or occasion.
3.
a factor related to or dependent upon other factors: Price is a function of supply and demand.
4.
Sociology the contribution made by a sociocultural phenomenon to an ongoing social system.
VERB (USED WITHOUT OBJECT)
5.
to perform a specified action or activity; work; operate: The computer isn't functioning now. He rarely functions before noon.
Source: Dictionary.com
There are a lot of definitions for a function. The simple definition would be a purpose or role. There are many more relative to the term.
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