Longman Dictionary of Contemporary English homepage

M.O.

 noun
     
Related topics: Nurses, Doctors, etc, Army
M.O. also MO British English
1 [singular]
modus operandi
a way of doing something that is typical of a particular person or group
2 [countable] especially British EnglishMNPMA
medical officer
an army doctor
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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