# function

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function is one of the 1000 most common headwords.
 fun - function - fund

function is on the Academic Word List.

## Noun

Function is on the Academic Vocabulary List.
1. (countable & uncountable) Something or someone's function is its purpose or its job.
The army sometimes performs a policing function.
2. (countable) A function is an organised event.
I met Sylvia at a church function last week.
3. (countable) If ${\displaystyle X}$ is a function of ${\displaystyle Y}$, then ${\displaystyle X}$ exists because of or is affected by ${\displaystyle Y}$
The speed of the computer is a function of its main processor.
When you see, ${\displaystyle Y=f(X)}$, you read it, "${\displaystyle Y}$ is a function of ${\displaystyle X}$". Here the value of ${\displaystyle Y}$ depends on the value assigned to the variable ${\displaystyle X}$.

## Verb

 Plain form function Third-person singular functions Past tense functioned Past participle functioned Present participle functioning
1. (intransitive) If something is functioning, it is working and is not completely broken.
Her heart stopped, but her brain continued to function.
2. (intransitive) If something functions as ${\displaystyle X}$, it does the job of ${\displaystyle X}$.
In this sentence, "sentence" functions as the subject.