| Term | Full Form | Definition | Meaning | Main Category | Subcategory | Country/ Region | Popularity |
|---|---|---|---|---|---|
| O | Oxygen | Academic & Science › Chemistry |  |
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| O | Oh | Academic & Science › Language & Linguistics | |
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| o | octet | Academic & Science › Units | |
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| O | Oberst | Governmental › Military |  |
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| O | Pyrrolysine | Medical › Biochemistry | |
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| O/o | Office of | Business › Business Terms | |
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| O2 | Oxygen | Academic & Science › Chemistry | |
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| O2O | Online to Offline | Business › Business Terms | |
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| O3b | Other 3 billion | Business › Companies & Corporations | |
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| OA | OsteoArthritis | Medical › Diseases & Conditions | |
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| OA | Open Access | Computing › Internet | |
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| OA | Oleic Acid | Academic & Science › Chemistry | |
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| OA | Output Area | Governmental › Census & Statistics |  |
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| OA | Order of the Arrow | Associations & Organizations › Regional Organizations |  |
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| OA | Organic Agriculture | Trees & Plants › Farming & Agriculture | |
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| OA | OverAll | Academic & Science › Language & Linguistics | |
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| OA | Oficina Anticorrupción | Governmental › Departments & Agencies |  |
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| OA | Overeaters Anonymous | Associations & Organizations › International Orgaizations | |
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| OA | Office Automation | Business › Business Terms | |
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| OA | Old Alleynian | Academic & Science › Universities & Institutions | |
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| OA | Orthogonal Array | Academic & Science › Mathematics | |
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| OA | Office Assistant | Business › Job Titles | |
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| OA | Operating Agreement | Governmental › Law & Legal | |
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| OA | Online Application | Computing › Internet | |
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| OA | Office Administration | Business › Business Terms | |
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