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IS
+++++ Information systems
+/--- International Standard
+/--- interim status
AcroLexic: Dictionary of Acronyms and Abbreviations contains 45 more definitions of “IS”.
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See also

Acronym Definitions
CIS 43
ISC 40
SIS 39
ISA 39
ISS 38
DIS 32
AIS 32
NIS 27
ISD 27
IST 26
MIS 25
EIS 24
ISP 24
IRIS 24
ISR 23
FIS 21
RIS 21
TIS 21
ISO 19
ISM 18