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What does O mean?

Looking for the meaning or definition of the word O? Here's what it means.

Letter
  1. The fifteenth letter of the English alphabet, called o and written in the Latin script.
Noun
  1. A blood type that lacks A or B antigens and may only receive transfusions of similar type O blood, but may donate to all (neglecting Rh factor). Synonym: universal donor.
Number
  1. The ordinal number fifteenth, derived from this letter of the English alphabet, called o and written in the Latin script.
Particle
  1. The English vocative particle, used for direct address.
Abbreviation
  1. (cricket) The number of overs bowled.
Noun
  1. (printing) American Library Association abbreviation of octavo, a book size (20-25 cm).
  2. (soccer) Someone associated with Leyton Orient Football Club, as a player, coach, supporter etc.
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