numero uno Hear it!

numero uno definition

nu·mero uno (no̵̅o̅′mer ō o̵̅o̅′nō)

Informal the very best or the most important one

Etymology: Sp número uno & It numero uno, number one

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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