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1 [uncountable] the best, most important, or most successful person or thing in a group : 
Until his marriage, his job was number one in his life.Shearson is number one in the market this year.
Until his marriage, his job was number one in his life.Shearson is number one in the market this year.2APM [uncountable and countable] the musical record that is the most popular at a particular time : number one in the charts They've had three number ones.
number one in the chartsThey've had three number ones.3 to look after yourself and not worry about other people, in a way that may seem selfish
look out for number one
also look after number one spoken4 [singular, uncountable] spoken informal a word meaning urine, used especially with children to avoid saying this
