Computing
- Adobe ImageReady, a bitmap graphics editor shipped with Adobe Photoshop by Adobe Systems
- Information retrieval, the science of searching for information in or as documents or databases
- Information revolution, one of the theoretical frameworks within which trends in current society can be conceptualized
- Institutional repository, a digital collection for preserving the intellectual output of an institution
- Institutional research, the collection, analysis, and reporting of institutional data
- Instruction register, part of a CPU's control unit
- Intermediate representation, a computer data structure
- Image retention, the LCD and plasma display equivalent of screen burn
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