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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