| Term | Full Form | Definition | Meaning | Main Category | Subcategory | Country/ Region | Popularity |
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| ART | Advanced Rapid Transit | Transport & Travel › Rail Transport |  |
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| ART | Watertown International Airport | Transport & Travel › Airport Codes |  |
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| ART | Autonomous-rail Rapid Transit | Transport & Travel › Land Transport |  |
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| ART | Aggression Replacement Training | Medical › Psychiatry & Mental Health | |
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| ART | Alternative Risk Transfer | Business › Business Terms | |
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| ART | Artists Repertory Theatre | Arts › Performing arts | |
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| ART | Albuquerque Rapid Transit | Transport & Travel › Land Transport | |
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| ART | American Refrigerator Transit | Transport & Travel › Rail Transport | |
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| ART | Avatar Repertory Theater | Arts › Performing arts | |
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| ARV | Approximate Retail Value | Business › Business Terms | |
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| ARV | Armed Response Vehicle | Governmental › Police |  |
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| ARV | Armored Recovery Vehicle | Governmental › Military | |
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| ARV | Lakeland Airport | Transport & Travel › Airport Codes | |
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| ARV | Anti-RetroViral | Medical › Medicines & Drugs | |
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| AS | American Samoa | Regional › Countries |  |
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| AS | Aksjeselskap | Business › Companies & Corporations |  |
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| As | Arsenic | Academic & Science › Chemistry | |
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| AS | Alaska Airlines | Transport & Travel › Airline Codes | |
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| AS | Asperger Syndrome | Medical › Diseases & Conditions | |
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| AS | Autonomous System | Computing › Networking | |
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| as | GNU Assembler | Computing › General Computing | |
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| AS | Aggregate Supply | Business › Business Terms | |
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| AS | Accounting Standard | Business › Accounting | |
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| AS | Anti-Spoofing | Technology › Specifications & Standards | |
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| as | Attosecond | Academic & Science › Units | |
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