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IO
+++++ input/output
++--- Information Operations
+---- intestinal obstruction
AcroLexic: Dictionary of Acronyms and Abbreviations contains 26 more definitions of “IO”.
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See also

Acronym Definitions
IOC 23
IOS 20
PIO 13
IOP 13
SIO 11
CIO 11
IOM 11
IOB 10
MIO 9
IOA 8
BIOS 8
SIOP 8
BIO 7
DIO 6
IOL 6
IOTA 6
IOR 6
ION 6
IOW 5
RIO 5