Question

What is the definition of a function?

Answer 1

https://www.mathsisfun.com/definitions/function.html

Answer 2

Function is used to define the dependence of one physical quatity on another.
Example Volume of a Sphere of radius r is given by V=4/3pi r^3

Answer 3

A function is a special relationship where each input has a single output. It is often written as "f(x)" where x is the input value.

More simple xD

Answer 4

I just gave a practical one... yours is simple I agree

Answer 5

Cheers for that m8!

Answer 6

http://mathworld.wolfram.com/Function.html

Answer 7

thank you so much