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- Dictionarynum·ber one/ˌnəmbər ˈwən/
noun
- 1. 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"
- 2. used in reference to oneself: "you must look after number one"
adjective
- 1. most important or prevalent; foremost: "a number-one priority"
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