number one

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num·ber one inf. • n. 1. oneself: you must look after number one.2. a person or thing that is the best or the most important in an activity or area: businesses that were number one in their markets. ∎  a best-selling record or book: an album featuring seventeen top movie themes and six number ones.3. used euphemistically to refer to urine, esp. in reference to children.4. a lieutenant junior grade in the navy or the coast guard.5. (or number two, etc.) the shortest (or next shortest, etc.) men's haircut produced with electric hair clippers.• adj. most important or prevalent: a number-one priority. ∎  best selling: a number-one album.

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