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AR Allergic Rhinitis 过敏性鼻炎

AR Aspect Ratio 纵横比，屏幕高宽比

AR Army Regulation 陆军调令

AR Address Register 地址储存器

AR Automatic Rifle 自动步枪

AR Acetal Resin 缩醛树脂，聚甲醛树脂

AR Atmospheric Research 大气研究

AR Attributable Risk 特异危险性

AR Annual Rate 年率

AR Adverse Reaction 有害反应，逆反应

AR Aqua Regia 王水

AR Alternate Routing 迂回[更替]通路，备用通路, 潜代径路，迂回[辅助]中继

AR Air Rifle 气枪

AR Anti-Radiation n. 反辐射

AR Antibiotic Resistance 抗生素抗性，抗菌素抗性

AR Annual Report 年度报告

AR Access Rate 接入率

AR Area Ratio 面积比

AR Annual Return 岁入

AR Active Region (sunspot observation) 现用区，激活区，作用区（太阳黑子观测）