O

noun
  1. The name of the Latin-script letter O.
  2. A zero (used in reading out numbers).
    It is currently two-
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o

noun
  1. The name of the Latin-script letter O.
  2. A zero (used in reading out numbers).
    It is currently two-
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o'clock

adverb, unpunctuated
  1. used to specify the hour when telling the time.
    the gates will open at eight o'clock
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o'er

adverb
  1. Thoroughly; completely; from beginning to end.
    I'm going to look over our department's expenses.
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