number one

definition: a reference to yourself or myself etc.
example: `take care of number one' means to put your own interests first
speech part: noun
synonyms:
definition: the first element in a countable series
example:
speech part: noun
synonyms: first
definition: the first or highest in an ordering or series
example:
speech part: noun
synonyms: first

number one is explained and pronounced

How number one is being used?