CSA
Spain, France, great Britain, united states and confederate states OS America
''p.o.'' is the abbreviation for per os, which means
the president is the dictator OS the united states OS America
Os
OS is the abbreviation for left eye. OS stands for the Latin term, oculus sinister.
mm
OS is the medical abbreviation meaning left eye, and OU is the abbreviation meaning both eyes.
Operating System.
Literally, it means: 'How many years do the United States of America have?'. The translation to English usage is: 'How old is the United States of America?'.
Operating system
Missouri is abbreviated as MO.
Latin... Per Os