| Term | Full Form | Definition | Meaning | Main Category | Subcategory | Country/ Region | Popularity |
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| i | information | Academic & Science › Language & Linguistics |  |
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| I | Current | Academic & Science › Electronics | |
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| I | Iodine | Academic & Science › Chemistry | |
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| i | italic | Computing › Internet | |
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| I | moment of inertia | Academic & Science › Physics | |
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| I | 1 (Roman numeral) | Academic & Science › Mathematics | |
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| I | Isoleucine | Medical › Biochemistry | |
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| I | Ionic strength | Academic & Science › Chemistry | |
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| i | imaginary unit/number | Academic & Science › Mathematics | |
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| I | Identity matrix | Academic & Science › Mathematics | |
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| i | internet | Business › Products | |
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| i | van 't Hoff factor | Academic & Science › Chemistry | |
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| I | Isospin | Academic & Science › Physics | |
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| I | luminous intensity | Academic & Science › Physics | |
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| i | innovation, a prefix to denote BMW electric vehicles | Technology › Automotive | |
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| i | orbital inclination | Academic & Science › Astronomy & Space Science | |
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| i | interlaced | Technology › Display & Graphics | |
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| I&B | Information and Broadcasting | Miscellaneous › Chat & Messaging | |
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| I18N | Internationalization | Computing › Programming & Development | |
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| I3A | International Imaging Industry Association | Associations & Organizations › Professional Associations | |
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| I3A | Installation Information Infrastructure Architecture | Governmental › Military |  |
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| I3A | Indole-3-Acetonitrile | Trees & Plants › Hormones & Nutritions | |
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| IA | Iowa | Regional › States & Districts | |
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| ia | inter alia | Academic & Science › Language & Linguistics | |
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| ia | Interlingua | Regional › Language Codes | |
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