In JavaScript what do they mean when they talk about partial functions? What is a partial function?

Question

Partial functions

Answer 1

ok,I found a website
www.webreference.com/programming/javascript/rg17/index.html

Answer 2

Im thinking it might be just a function passed as an argument to another function but I really dont understand partial functions.

Answer 3

I think it should be using partial function arguments and leave the rest be.
Correct me I am wrong.