| Term | Full Form | Definition | Meaning | Main Category | Subcategory | Country/ Region | Popularity |
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| T | Temperature | Academic & Science › Units |  |
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| T | Tera | Academic & Science › Units | |
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| T | Time period | Academic & Science › Units | |
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| T | Tesla | Academic & Science › Units | |
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| t | time | Academic & Science › Mathematics | |
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| T | Teen | Computing › Games & Entertainment | |
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| T | Threonine | Medical › Psychology | |
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| T | Thymine | Medical › Genetics | |
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| T | Testosterone | Medical › Biochemistry | |
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| t | tonne | Academic & Science › Units | |
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| T | Telekom | Business › Companies & Corporations | |
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| T | Tyrannosaurus | Animal Kingdom › Wildlife | |
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| T | Treasury | Governmental › Departments & Agencies | |
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| T | Tritium | Academic & Science › Chemistry | |
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| T | Telephone | Business › Business Terms | |
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| T | Tablespoon | Academic & Science › Units | |
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| t | teaspoon | Academic & Science › Units | |
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| T | Thymus | Medical › Anatomy & Physiology | |
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| T | Time-reversal | Academic & Science › Physics | |
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| T | Massachusetts Bay Transportation Authority | Transport & Travel › Land Transport |  |
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| T | Oslo Metro | Transport & Travel › Rail Transport |  |
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| T | Stockholm metro | Transport & Travel › Rail Transport |  |
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| T | Pittsburgh Light Rail | Transport & Travel › Rail Transport | |
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| T | Three-millimeter | Sports & Games › Other Games | |
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| T-Bill | Treasury Bills | Governmental › Policies & Programs | |
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