IIR
IIR definition by Slang.net
This page explains what the acronym "IIR" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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IIR stands for "if I remember." It is both slightly shorter and much less commonly used than the similar acronym IIRC.
When you ask someone a question via online chat, forums, or email, the person answering might preface their answer with IIR. This indicates that the person is unsure whether their answer is entirely accurate, either because their knowledge is hearsay or they're possibly misremembering.