numero uno

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nu·me·ro u·no

 (no͞o′mə-rō o͞o′nō, nyo͞o′-)
n. Slang
1. One that is first in rank, order, or importance.
2. One's own interests; oneself.
adj.
Number one.

[Spanish número uno or Italian numero uno, number one.]

num′ber one′


n.
1. oneself, esp. one's own well-being.
adj.
2. of the highest quality; first-rate: a number one performance.