What Is a Oner in Money?

A 'oner' usually means £100 in British slang. It can occasionally mean £1, so the amount depends on context.

Also spelled 'oncer', the word comes from "one", and the surrounding conversation tells you which value is meant.

---

Key Takeaways

• A oner most often means £100 in everyday British slang.
• It can also mean £1, so context decides which amount is meant.
• It is also spelled "oncer", with the same meanings.
• The word simply comes from "one", standing for a single note or unit.

---

What Does 'Oner' Mean?

In its most common use, a oner is £100. So "he owes me a oner" usually means £100.

The word can also mean a single pound, especially in older usage. When the amount is small and everyday, "a oner" may mean £1.

Because it has two possible values, listeners rely on context to work out which is meant.

Where Does 'Oner' Come From?

The word is built straight from "one". A oner is "one" of something, whether one hundred pounds or one pound.

The "oncer" spelling reflects the same idea and is often used specifically for a single note. Both forms have been in British slang for many years.

How People Use 'Oner'

You will hear it with debts, prices, and round sums.

For example: "That'll set you back a oner" points to £100 in most modern use. If the setting clearly involves pennies and pounds, it may mean £1 instead.

A Oner Versus Other £100 Slang

A oner shares the £100 meaning with a ton. "Ton" is the more widely understood word for £100.

For nearby amounts, a score is £20 and a monkey is £500. See our Cockney slang for money guide for the full set.

Frequently Asked Questions

Does a oner mean £100 or £1?

Usually £100. It can mean £1 in some contexts, so the surrounding conversation is your guide.

Is "oner" the same as "oncer"?

They are variants of the same word. "Oncer" is often used for a single note, while both can mean £100 or £1.

Is a oner the same as a ton?

When it means £100, yes. "Ton" is the clearer, more common word for £100.

Where does the word come from?

It comes directly from "one", standing in for a single unit, whether that unit is a pound or a hundred pounds.

A light guide to British money slang.