A Atomic (as in A-bomb) 原子(如原子弹)

A-D Analog to Digital (A/D)模拟信号到数字信号

A/B Afterburning n. 燃尽(后燃, 补充燃烧)

A/C Alternating Current adj. 交流电的

A/D Aerodrome n. 飞机场

A/N Alphanumeric 字母数字的

A/O As Of 自...起, 截至

A/P Anatomy and Physiology 解剖学与生理学

A/S Assistant Secretary 助理国务卿

A/V Audio/Video 音频/视频

A&M Agricultural and Mechanical (school, as in Texas A&M) 农业机械(学校,如在往德克萨斯州农工)

A&W Allen and Wright (fast food restaurant and root beer) 艾伦和赖特(速食店和根啤酒)

AA Associate in Arts (degree) 在艺术(程度)

AAA Amateur Athletic Association (of England) 业余田径协会(英格兰)

AAAA Association for Applied Animal Andrology 应用动物Andrology

AAAASF American Association for Accreditation of Ambulatory Surgery Facilities 美国协会的认证,日间手术设备

AAABEM American Association of Acupuncture and Bio-Energetic Medicine 美国医学协会Bio-Energetic针灸

AAAC Asian Association for Algorithms and Computation 亚洲协会和计算算法

AAAG American Association of Anthropological Genetics 美国人类学协会的遗传

AAAI Association for the Advancement of Artificial Intelligence (Menlo Park, California) 进步协会的人工智能(门洛帕克市,加州)