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O
++/-- Oxygen
/---- operations
/---- ostwarts
AcroLexic: Dictionary of Acronyms and Abbreviations contains 5 more definitions of “O”.
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See also

Acronym Definitions
OD 40
OP 40
OA 40
SOC 35
OC 35
PO 35
CO 34
OR 34
ASO 34
OS 33
DO 32
OM 32
SO 31
SOL 30
MOD 30
COR 29
IO 29
PRO 29
POS 29
POP 28