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OR
+++++ Oak Ridge
+++-- Oregon
++/-- Operating room
AcroLexic: Dictionary of Acronyms and Abbreviations contains 31 more definitions of “OR”.
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See also

Acronym Definitions
COR 29
ORD 19
SOR 17
ORS 14
EOR 13
POR 13
MOR 12
DOR 12
TOR 12
FOR 12
CORN 12
CORE 11
ORG 11
CORR 11
ORA 11
NOR 10
BOR 9
ORC 9
DORIS 9
ORR 9