numero uno

== English == === Etymology === From either Spanish número uno or Italian numero uno. Piecewise doublet of number one. === Noun === numero uno (plural numero unos) (informal) The most important of a group. Synonyms: see Thesaurus:important person (informal) Oneself, especially one’s own interests. ==== Related terms ==== look out for number one == Italian == === Noun === numero uno m the first in a series, or the most important in a group ==== Derived terms ==== nemico pubblico numero uno