ABCA abbr. American Building Contractors Association 美国建筑承包商协会; American Business Communication Association 美国商业交流协会; American-British-Canadian-Australian 美国-英国-加拿大-澳大利亚; Antique Bottle Collectors Association 古瓶收集者协会
abcd abbr. atomic, biological, chemical, and damage (control) 原子; above and beyond the call of duty 超越职责之外的; awaiting bad conduct discharge 美国因行为不端听候解职处理; airway (opened) , breathing (restored) , circulation (restored) , definitive (therapy) 空中航线（开放的）