Longman Dictionary of Contemporary English homepage

number one

2 adjective
     
number one2
1 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 model
2 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.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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