Noun number one has 3 senses
  1. number one - a reference to yourself or myself etc.; `take care of number one' means to put your own interests first
    --1 is a kind of
    self
  2. first, number one - the first or highest in an ordering or series; "He wanted to be the first"
    --2 is a kind of rank
    --2 has particulars: former
  3. first, number one, number 1 - the first element in a countable series; "the first of the month"
    --3 is a kind of ordinal number, ordinal, no.
,
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