| AT | Air Transport(ation) | 空运 |
| AT | American Terms | 美国用语 |
| AT | Atlantic Time | 大西洋时间 |
| AT | Automatic Ticketing | 自动订票 |
| AT | Atmosphere | 大气 |
| AT | Attachment | 附件 |
| AT | Anti-Terrorism | 反恐怖主义 |
| AT | Acceptance Testing | 验收测试 |
| AT | Austria | 奥地利 |
| AT | Astatine | 砹（化学元素） |
| AT | Ataxia telangiectasis | 共济失调性毛细血管扩张症 |
| AT | Ampere Turn | 安培数 |
| AT | Advanced Technology | 先进技术 |
| AT | type adenine and thymine type | 腺嘌呤与胸腺嘧啶型（戊糖核酸） |
| AT | Acid Treatment | 酸处理 |
| AT | Air Temperature | 空气温度 |
| AT | Ambient Temperature | 周围介质温度，环境温度 |
| AT | Army Train | 军用列车 |
| AT | Antitank | 反坦克的 |
| AT | Atmosphere | (标准)大气压(单位) |
| AT | Atomic | 原子的 |
| AT | Automatic Telephone | 自动电话(机) |
| AT | Automatic Transmitter | 自动发报机 |
| AT | Automatic Typerwriter | 自动打字机 |
| AT | Autotransformer | 自耦变压器 |
| AT | Air Traffic | 空中交通 |
| AT | Air Transport | 空运(业)，[采矿]风力运输，气浪 |
| AT | Angiotensin | 血管紧缩素 |
| AT | Access Time | 存取时间，访问时间 |
| AT | Attenuator | 衰减器 |
| AT | Alimentary Tract | 消化道，营养管 |
| AT | Assay Ton | [采矿]化验吨 |
| AT | Audit Trail | 查帐索引，审计追踪，检查追踪 |
| AT | AppleTalk | Mac机所用的网络协议之一 |
| AT | Antarctic Treaty | 南极条约 |
| AT | Atomic Time | 原子钟时间 |
| AT | Asynchronous Transmission | 异步传输 |
| AT | Available Time | 可用时间 |
| AT | Advanced Treatment | 深度处理，高级处理 |
| AT | Access Type | 存取类型，访问类型 |
| AT | Averaging Time | 平均次数（时间） |
| AT | Acceptance Trials | 验收试验 |
| AT | Answering Tone | 应答音 |
| AT | Analog Trunk | 模拟中继 |
| AT | Automatic Transaxle (Transmission) | 自动变速器 |
| AT | Assessment Tool | 估价工具 |
| AT | Agreement Terms | 协议条款 |
| AT | Antenna | 天线 |
| AT | Address Translator | 地址转译器 |
| AT | Attribute Table | 属性表 |
| AT | Alaska Telecommunications | 阿拉斯加电信 |
| AT | Awaiting Transportation | 等待运输 |
| AT | Arranged Team (gaming) | 安排的团队（游戏） |
| AT | Advanced Treatment (environment) | 高级处理（环境） |
| AT | Angst Technology (web comic strip) | Angst技术（网络漫画） |
| AT | Avian Tuberculosis | 禽结核病 |
| AT | Asti, Piemonte (Italian province) | 皮埃蒙特阿斯蒂（意大利省） |
| AT | Army Training | 陆军训练 |
| AT | Acceptance Trial | 验收试验 |
| AT | Alkaline Trio (band) | 碱性Trio（波段） |
| AT | Auto Transformer | 自动变压器 |
| AT | Arabesque Travel | Arabesque旅行 |
| AT | Armored Trooper (anime) | 装甲骑兵（动漫） |
| AT | Army Telegraph (philatelic overprint, South Africa) | 陆军电报（集邮套印，南非） |
| AT | Allowance Type | 津贴类型 |
| AT | Aviation Electronics Technician (Navy Rate) | 航空电子技师（海军费率） |
| AT | Awaiting Transfer | 等待转移 |
| AT | Aliveness Test | 活性试验 |
| AT | Anti-Tampering | 防篡改 |
| AT | Anaerobic Threshold | 厌氧阈值 |
| AT | All Terrain | 全地形 |
| AT | Annual Training | 年度培训 |
| AT | Appropriate Technology | 适当的技术 |
| AT | applanation tonometry | 压平眼压计 |
| AT | Atrial Tachycardia | 心房性心动过速 |
| AT | axillary temperature | 腋温 |
| AT | Antithrombin | 抗凝血酶 |
| AT | Absolute Terror | 绝对恐怖 |
| AT | Applied Technology | 应用技术 |
| AT | Assistive Technology | 辅助技术 |
| AT | Acceptance Test | 验收测试 |
| AT | Ataxia-Telangiectasia | 共济失调毛细血管扩张症 |
| AT | Anti-Terrorist | 反恐 |
| AT | Alert Time | 警报时间 |
| AT | Anti-Tank | 反坦克 |
| AT | Acquisition Team | 收购团队 |
| AT | Airtight | 密封的 |
| AT | Asynchronous Terminal | 异步终端 |
| AT | Atmospheric Transmission | 大气传输 |
| AT | Access Tandem | 接入串联 |
| AT | Advanced Technology (IBM PC AT personal computer) | 先进技术（IBM PC AT个人计算机） |
| AT | Automatic Transmission | 自动变速器 |
| AT | Appalachian Trail | 阿帕拉契TRail |
| AT | Architectural Technologist/Techinician (professional accreditation) | 建筑学专业认证/ Techinician阿尼哥() |
| AT | AppleTalk (Apple local area network technology) | AppleTalk（苹果局域网技术） |
| AT | Alexander Technik | Alexander Technik公司 |
| AT | Aerotech (model rocket corporation) | Aerotech（火箭模型公司） |
| AT | Atomic Terrorism | 原子恐怖主义 |