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IR
+++++ Infrared
/---- iridium
/---- Information retrieval
AcroLexic: Dictionary of Acronyms and Abbreviations contains 48 more definitions of “IR”.
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See also

Acronym Definitions
IRS 27
IRIS 24
SIR 22
CIR 20
IRC 20
IRA 19
PIR 19
IRM 19
TIR 17
MIR 17
IRF 15
IRB 14
IRR 14
IRD 14
FIR 12
IRP 12
SIRS 11
EIR 11
IRT 10
AIR 10