Collins Concise English Dictionary © HarperCollins Publishers::

mo /məʊ/ n informal
  1. chiefly Brit
    short for moment
  2. chiefly Austral
    short for moustache



MO abbreviation for
  1. Missouri
  2. Medical Officer
  3. modus operandi



Mo the chemical symbol for
  1. molybdenum



m.o., MO abbreviation for
  1. mail order
  2. money order



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