| item | description | category | filter | more on... |
| OTO | Once- Through Oil | Other/Transportation |
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| OTO | One Time Only | Business/General |
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| OTO | One Time Only | Business/Accounting |
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| OTO | One To One | Edu./Mathematics |
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| OTO | One-Time-Only | Governmental/NASA |
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| OTO | Operations And Training Officer | Governmental/Military |
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| OTO | Otology | Medical/Physiology |
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| OTO | Otomian Languages | Regional/Language Code /3 |
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| OTO | Overture To Orchestra | Music |
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