| item | description | category | filter | more on... |
| OIR | Office of Institutional Research | Edu./Universities |
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| OIR | Office of Instructional Resources | Edu./Universities |
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| OIR | Okushiri, Japan | Regional/Airport Codes |
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| OIR | Online Insert and Removal | IT/Hardware |
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| OIR | Operational and Information Requirements | Governmental/Military |
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| OIR | Operations Integration Review | Governmental/NASA |
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| OIR | Optima Investment Research | Business/Firms |
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