# numero uno

> English word · Noun

## Definitions
1. The most important of a group.
2. Oneself, especially one’s own interests.

## Etymology
From either Spanish número uno or Italian numero uno. Piecewise doublet of number one.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/numero-uno