one-off
B2Informal, Business
Definition
Meaning
Something that happens, is made, or is done only once and is not repeated.
Can refer to a unique event, a single-payment deal, a specially commissioned product, or a non-recurring job or task. Informally, can describe an eccentric or unique person.
Linguistics
Semantic Notes
Often hyphenated, but can be written as "one off" (especially in British English). As a noun, it describes the event/item itself. As an adjective, it describes the single-occurrence nature of something.
Dialectal Variation
British vs American Usage
Differences
More common in British English, but fully understood in American English. In American business contexts, 'one-time' is a frequent alternative.
Connotations
In UK, it can strongly imply 'special edition' or 'non-standard'. In US, it may more neutrally mean 'single instance'.
Frequency
Higher frequency in UK English across all registers (spoken, journalism, business).
Vocabulary
Collocations
Grammar
Valency Patterns
[be] a one-off[make/produce/commission] a one-off[pay/charge] a one-off [fee/payment][adjective] one-offVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “He's a one-off! (meaning a unique/eccentric person)”
Usage
Context Usage
Business
Refers to a single, non-repeating transaction, cost, or project (e.g., 'a one-off restructuring charge').
Academic
Used in research to describe a unique event or a single experimental condition.
Everyday
Describes a special event, purchase, or situation that won't happen again (e.g., 'It's a one-off, I'm not making a habit of it').
Technical
In engineering/manufacturing, refers to a prototype or a single custom-made item.
Examples
By Part of Speech
verb
British English
- N/A – not standard as a verb.
American English
- N/A – not standard as a verb.
adverb
British English
- N/A – not standard as an adverb.
American English
- N/A – not standard as an adverb.
adjective
British English
- They agreed a one-off bonus for the exceptional work.
- It was a one-off performance for charity.
American English
- The company took a one-off charge against earnings.
- We're offering a one-off discount for new customers.
Examples
By CEFR Level
- The concert was a one-off. It will not happen again.
- I made a one-off payment for the course.
- The designer created a one-off dress for the awards ceremony.
- This error was a one-off, so we don't need to change the system.
- The bank levied a one-off administration fee on the transaction.
- The magazine published a one-off special edition to mark the anniversary.
- The tax amnesty was a political one-off, unlikely to be repeated by future administrations.
- His theory posits that the event was not a one-off but part of a broader, cyclical pattern.
Learning
Memory Aids
Mnemonic
Think of turning a machine 'ON' just 'OFF' once. It ran only a single time – a ONE-OFF run.
Conceptual Metaphor
UNIQUENESS IS A SINGLE EDITION (a printed copy that exists only once).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Avoid literal translation as 'один выключен'.
- Do not confuse with 'once in a lifetime' (раз в жизни), which is more about rare opportunity.
- Not equivalent to 'одноразовый' which primarily means 'disposable'.
Common Mistakes
- Using 'one-of' instead of 'one-off'.
- Using it as a verb (e.g., 'We will one-off this project' – incorrect).
- Overusing as a synonym for 'special' when repeatability is not the key issue.
Practice
Quiz
In which context is 'one-off' LEAST appropriate?
FAQ
Frequently Asked Questions
It is common in business and journalism but retains an informal tone. In very formal writing, alternatives like 'single', 'non-recurring', or 'unique instance' may be preferred.
Yes, informally. Calling someone 'a one-off' means they are highly unusual, eccentric, or unique in some way.
They are largely synonymous, but 'one-off' is more common in British English and can imply something specially made. 'One-time' is more neutral and common in American English.
Yes, especially in British English (e.g., 'a one off'). However, the hyphenated form 'one-off' (adjective and noun) is standard in dictionaries and recommended for clarity.