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OP
+++++ operation
++++- operating plan
+++-- Observation Post
AcroLexic: Dictionary of Acronyms and Abbreviations contains 37 more definitions of “OP”.
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See also

Acronym Definitions
POP 28
MOP 27
COP 27
OPS 23
BOP 21
SOP 21
ROP 21
OPA 18
OPT 17
TOP 17
OPR 16
OPC 14
SCOPE 14
DOP 14
IOP 13
TOPS 13
EOP 13
OPP 13
OPD 12
POPS 11