numero uno
C1Informal, humorous, sometimes ironic
Definition
Meaning
The most important, prominent, or best person or thing.
A self-referential term for oneself, often used with humorous self-importance to imply that one is the top priority.
Linguistics
Semantic Notes
The term is a pseudo-Italian or pseudo-Spanish borrowing (literally 'number one') used exclusively in English. It often carries a tone of light-hearted boasting or ironic self-aggrandizement. Can be used both descriptively and self-referentially.
Dialectal Variation
British vs American Usage
Differences
More commonly used in American English. In British English, alternatives like 'top dog' or 'number one' are often preferred, though 'numero uno' is understood.
Connotations
In both dialects, it carries informal, jocular connotations. In American usage, it can be slightly more integrated into casual speech for self-reference.
Frequency
Low-to-medium frequency in AmE; low frequency in BrE.
Vocabulary
Collocations
Grammar
Valency Patterns
[Subject/Person] is the numero uno [in/of field][Subject] looks after numero uno (oneself)It's all about numero uno.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “Looking out for numero uno (taking care of oneself first).”
Usage
Context Usage
Business
Rare in formal business; used jokingly in internal communications to refer to a top performer or priority project.
Academic
Virtually never used.
Everyday
Used in casual conversation for humorous emphasis on being first or most important.
Technical
Not used.
Examples
By Part of Speech
adjective
British English
- He had a very numero-uno attitude about the whole affair.
American English
- She's the numero-uno expert in the department.
Examples
By CEFR Level
- In this game, you are numero uno!
- When it comes to customer satisfaction, that client is our numero uno priority.
- With a wry smile, he toasted 'to numero uno,' making it clear his own interests came first.
Learning
Memory Aids
Mnemonic
Think of a runner with a large '№1' on their chest, but instead of saying 'number one,' they say it with a flamboyant Italian accent: 'Numero Uno!'
Conceptual Metaphor
IMPORTANCE/STATUS IS NUMERICAL RANK (Being first in a sequence metaphorically means being the most important).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate literally as 'номер один' in contexts where it refers to oneself humorously; the Russian phrase lacks the same idiomatic, self-referential sense.
- Avoid using in formal contexts; it is not the equivalent of 'главный' or 'основной' in tone.
Common Mistakes
- Using it in formal writing.
- Misspelling as 'numero uno' (correct: 'numero uno').
- Using it without the humorous/ironic tone where it sounds arrogant.
Practice
Quiz
In which context would 'numero uno' be LEAST appropriate?
FAQ
Frequently Asked Questions
No, it is strictly informal and often humorous or ironic.
Yes, it can refer to the most important item, task, or priority (e.g., 'Safety is numero uno').
It is borrowed directly from Italian and Spanish, meaning 'number one,' and has been used in English since the mid-20th century.
It can be if used seriously about oneself. More often, it's used with a knowing, self-deprecating, or playful tone to soften the boast.
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