function

The word “function” means the purpose something serves or the job it does. In plain terms, what something is for or does — a purpose, a formal event, or (technically) a mathematical/programming rule.

“Function” is pronounced FUHNG-shuhn (/ˈfʌŋkʃən/ in IPA).

Here is “function” used in a sentence: “The function of a thermostat is to regulate temperature.”

Depending on how it is used, “function” can be a noun and a verb.

The word “function” comes from Latin. From Latin functio, "performance, execution," from fungor, "to perform or discharge.".

“Function” is a very common word in modern English, usually learned at around the A2 level.

“Function” has 4 distinct senses listed in this dictionary. The most common is: the purpose something serves or the job it does.

Purpose is the reason something exists — the intention behind it. Function is what it actually does — its role or operation in practice. A chair's purpose is to let people sit; its function is to support weight. Purpose answers 'why,' while function answers 'what does it do.' The two often overlap.

A role is the part something plays within a larger system or group, often suggesting responsibility or identity. A function is the specific job or purpose it carries out. They're close in meaning, but 'role' leans toward position and 'function' toward action — what the thing is actually there to do.

Besides purpose or role, 'function' has several senses. In mathematics, it's a rule linking each input to one output. In computing, it's a named, reusable block of code. Socially, a 'function' is a formal event or gathering. As a verb, to function means to work or operate properly.

Yes. Many things are multifunctional, serving several purposes at once. A smartphone functions as a phone, camera, map, and computer. In biology, a single organ can perform multiple functions. Having more than one function often makes a tool or object more useful, though sometimes at the cost of simplicity.