| item | description | category | filter | more on... |
| OPI | Occupational Performance Issue | Business/Firms |
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| OPI | Oenpelli, Northern Territory, Australia | Regional/Airport Codes |
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| OPI | Office Products International | Business/Firms |
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| OPI | Officer of Principal Interest | Governmental/Military |
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| OPI | Online Product Information | Business/General |
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| OPI | Open Payment Initiative | Business/Accounting |
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| OPI | Open Prepress Interface | Uncategorized |
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| OPI | Open Prepress Interface | IT/General |
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| OPI | Opinion Research Corporation | Business/General |
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| OPI | Oral Presentation Initiative | Governmental/Military |
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| OPI | Oral Proficiency Interview | Edu./Universities |
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| OPI | Orbiter Payload Interrogator | Governmental/NASA |
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| OPI | Other Peoples Interviews | Edu./Botany |
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