- number one
- .number 'one1 n1.) [U]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.2.) [U and C]the musical record that is the most popular at a particular time▪ number one in the charts▪ They've had three number ones.3.) look out for number one also look after number onespoken to look after yourself and not worry about other people, in a way that may seem ↑selfish4.) [singular, U] spoken informal a word meaning ↑urine, used especially with children to avoid saying this directlynumber one 2.number 'one2 adj1.) most important or successful in a particular situation▪ The University of Maine has the number one hockey team in the country.▪ Sweden's number one model2.) first on a list of several things to be considered, done etc▪ item number one on the agenda▪ This has got to be our number one task.
Dictionary of contemporary English. 2013.