M.O. (also MO British English) /ˌem ˈəʊ $ -ˈoʊ/ noun

1. [singular] (modus operandi) a way of doing something that is typical of a particular person or group

2. [countable] especially British English (medical officer) an army doctor

[TahlilGaran] Dictionary of Contemporary English ▲

MO
the written abbreviation for Missouri

[TahlilGaran] Dictionary of Contemporary English ▲

mo /məʊ $ moʊ/ noun [singular]
British English spoken a very short period of time Synonym : moment:
Wait a mo!
I’ll be back in a mo.

[TahlilGaran] Dictionary of Contemporary English ▲

mo. American English
the written abbreviation of month

[TahlilGaran] Dictionary of Contemporary English ▲

MO
Missouri 
Modus Operandi 
Month

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲