| Term | Full Form | Definition | Meaning | Main Category | Subcategory | Country/ Region | Popularity |
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| A | Ampere | Academic & Science › Units |  |
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| a | atto | Academic & Science › Units | |
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| A | symbol for Argon, until 1957 | Academic & Science › Chemistry | |
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| A | Adenine | Medical › Biochemistry | |
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| A | Blood Type A | Medical › Anatomy & Physiology | |
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| A | Address | Computing › Internet | |
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| A | Auto start-stop | Technology › Automotive | |
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| A | Adult | News & Entertainment › Movies & Film |  |
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| A | Mass Number | Academic & Science › Chemistry | |
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| A | Angstrom | Academic & Science › Units | |
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| A | Vitamin A | Medical › Biochemistry | |
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| A | Type A (Battery Size) | Academic & Science › Electronics | |
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| A | Agilent Technologies | Business › NYSE Symbols |  |
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| A | Helmholtz Energy | Academic & Science › Physics | |
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| A/D | Analog-to-Digital | Academic & Science › Electronics | |
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| A2A | Application-to-Application | Computing › Programming & Development | |
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| A2A | Ask to Answer | Computing › Internet | |
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| A2A | Account to Account | Business › Banking | |
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| A2A | Access to Archives | Computing › Websites |  |
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| A2A | Athens to Atlanta | Sports & Games › Outdoor & Adventure | |
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| A2DP | Advanced Audio Distribution Profile | Technology › Communication | |
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| A9 | a standard paper size, defined by ISO 216, with dimensions: 37 x 52 mm | Technology › Imaging & Printing | |
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| A9 | numeronym to represent Algorithms (A+ 9 other letters) | Business › Companies & Corporations | |
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| AAA | Authentication, Authorization and Accounting | Computing › Protocols | |
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| AAA | American Automobile Association | Associations & Organizations › Regional Organizations | |
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