# function

The Simple English Wikipedia has an article on:
function is one of the 1000 most common headwords.
 function

Function is part of the Academic Word List. It is important for students in college and university.

## Noun

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 formfunction Third-person singularfunctions Past tensefunctioned Past participlefunctioned Present participlefunctioning
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.