Dictionary.com
definitions
  • synonyms

numero uno

[noo-muh-roh oo-noh, nyoo-]
See more synonyms on Thesaurus.com
noun
  1. number one(defs 1, 2).
adjective
  1. number one(def 4, 5).

Origin of numero uno

Borrowed into English from Italian around 1970–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018