Definition of "number 1" []

• The first element in a countable series (noun)

WordNet. Princeton University. 2010.

• "Jake looked at me as if I was the world’s number 1 moron, and it didn’t make me feel any better when Anju’s expression grew even darker."
• "The Praetorian bands, whose licentious fury was the first symptom and cause of the decline of the Roman empire, scarcely amounted to the last-mentioned number 1 They derived their institution from"