| 序号 | 英文 | 音标 | 词性 | 中文 |
| | CHM | | | =Chemical Machining 化学加工 |
| | CHQ | | | =Corps Headquarters 军(司令)部 |
| | CHS | | | =Canadian Hydrographic Service 加拿大水文局 |
| | CHU | | abbr. | centigrade heat unit百分温标热单位,摄氏热单位 |
| | CI | | | =Calling Indicator 调用指示器 |
| | CI-cost and insurance | | | [商]保险费在内 |
| | CIA | | n. | 中央情报局 |
| | CIAA | | abbr. | Central Intercollegiate Athletic Association(美国)大学间中央体育协会 |
| | CIBA | | | www.iciba.net |
| | CIC | | | commander-in-chief, 最高司令官 |
| | CICS | | | 客户信息控制系统 |
| | CID | | | =Commission for International Development 国际开发委员会 |
| | CIE | | | =Coherent Infrared Energy 相干红外能量 |
| | CIF | | abbr. | [商]Cost Insurance and Freight 到岸价格 |
| | CIG | | | =Chemical Ion Generator 化学的离子发生器 |
| | CIGS | | abbr. | Chief of Imperial General Staff[史](英)帝国总参谋长 |
| | CIM | | abbr. | [军] Communication Interface Module, 通讯接口模块 |
| | CIMS | | n.；abbr. | n. 计算机集成制造系统；abbr. 计算机集成制造系统 |
| | CINC | | abbr. | Commander in chief总司令 |
| | CINCCONAD | | | =Commander-in-Chief, Continental Air Defense 大陆防空司令部总司令[美] |
| | CINCEASTLANT | | | =Commander-in-Chief, Eastern Atlantic Area 东大西洋地区盟军总司令(北约) |
| | CINCENT | | | =Commander-in-Chief, Allied Forces Central Europe 中欧盟军总司令(北约) |
| | CINCEUR | | | =Commander-in-Chief, Europe 欧洲总部总司令[美] |
| | CINCLANTFLT | | | =Commander-in-Chief, Atlantic Fleet 大西洋舰队司令[美] |
| | CINCMED | | | =Commander-in-Chief, British Naval Forces in the Mediterranean 地中海英国海军总司令 |
| | CINCUSNAVEUR | | | =Commander-in-chief, United States Navy Forces, Europe 美国驻欧洲海军司令 |
| | CINDA | | | =Computer Index Neutron Data 中子数据计算机索引 |
| | CINS | sInz | | [单复同]n.<美>需监管的孩子(Child(ren)In Need of Supervision 的首字母缩略词) |
| | CIO | | abbr. | Congress of Industrial Organizations, 美国产业工会联合会 |
| | CIP | | abbr. | catalog(u)ing in publication预编目录,出版过程中编目 |
| | CIQ | | | custom,immigration,quarantine,海关 |
| | CIR | | | =Canada -India Reactor 加印反应堆[印] |
| | CIRIA | | | =Construction Industry Research and Information Association 建筑工业研究与情报协会［美］ |
| | CIRIS | | | =Completely Integrated Reference Instrumentation System 全集成基准仪表系统 |
| | CIRM | | | =Celestia Infra-Red Mapper 天体红外测绘仪 |
| | CIRS | | | Cost Information Retrieval System 成本情报检索系统 |
| | CIRT | | | =Conference on Industrial Robot Technology 工业机器人技术会议 |
| | CIS | | abbr. | 独联体 |
| | CISC | | | [计] 复杂指令集计算机 |
| | CISI | | | =Centre for Inventions and Scientific Information 发明与科技情报中心 |
| | CISM | | abbr. | <法>Conseil International du Sport Militaire 国际军事体育理事会(=International Military Sports Council) |
| | CIT | | | =California Institute of Technology [美]加利福尼亚理工学院 |
| | CITE | | | Current information Tapes for Engineers 《最新工程资料磁带》 |
| | CITIC | | | 中国国际信托投资公司 |
| | CITRAC | | | =Central Integrated Traffic Control 中心综合交通管制 |
| | CITS | | | =Central Integrated Test System 中心综合测试系统 |
| | CIU | | | =Computer Interface Unit 计算机接口设备 |
| | CJ | | | Construction Joint 施工缝， 构件接头 |
| | CJCS | | | =Chairman of the Joint Chiefs of Staff 参谋长联席会议主席［美］ |
| | CK | | | =Call Key 呼叫键 |
| | CKD | | abbr. | completely knocked down 完全拆开的,完全分解的 |
| | CL | | | Compiler Language 编译程序语言 |
| | CLA | | abbr. | College Language Association(美国)大学语言协会 |
| | CLASP | | | Computer Language for Aeronautics and Space Programming 航空与航天编程序用的计算机语言 |
| | CLASS | | | Container-Lighters Aboard Ship System 集装箱-驳船船舶装运系统 |
| | CLAT | | | Communication Line Adapter for Teletype 电传通信线路适配器 |
| | CLC | | abbr. | Canadian Labour Congress加拿大劳工大会 |
| | CLEA | | | =Conference on Laser Engineering and Application 激光工程与应用会议（［美］OSA与IEEE） |
| | CLEAR | | | =Closed Loop Evaluation and Reporting 闭回路鉴定与报告 |
| | CLEC | | | =Closed Loop Ecological Cycle 闭合路的生态循环 |
| | CLG | | | =Guided Missile Light Cruiser 轻型导弹巡洋舰 |
| | CLGP | | abbr. | [军] Cannon Launched Guided Projectile, 加农炮发射导弹 |
| | CLIP | | | Computer Layout Installation Planner 计算机布局安装规划程序 |
| | CLOS | | abbr. | [军] Command to Line of Sight, 瞄准线指令 |
| | CLP | | | Container Load Plan (集装的)装箱单 |
| | CLR | | | [计] 计算机语音记录器 |
| | CLSC | | | =Chautauqua Literary and Scientific Circle 肖托夸文学与科学学会［美］ |
| | CLT | | | [计] 计算机语言翻译程序 |
| | CLU | | abbr. | Chartered Life Underwriter 特许人寿保险人 |
| | CLUW | | abbr. | Coalition of Labor Union Women (美国)工会妇女联盟 |
| | CLW | | | ClassWizard生成的用来存放类信息的文件。 |
| | CM | | | Current Measurements 海流测量 |
| | CMA | | abbr. | Canadian Medical Association加拿大医学会 |
| | CMAA | | | =Crane Manufacturers Association of America 美国起重机厂商协会 |
| | CMB | | abbr. | Chase Manhattan Bank 美国大通曼哈顿银行 |
| | CMC | | | Critical Micelle Concentration 临界胶束浓度 |
| | CMD | | | =Coal Mines Department 煤矿管理局［美］ |
| | CMDAC | | | =Current Mode Digital-to-Analog Converter 通用数字-模拟变换器 |
| | CMEA | | | 经济互助委员会 |
| | CMERI | | | =Central Mechanical Engineering Research Institute 中央机械工程研究所［印］ |
| | CMESA | | | =Canadian Military Electronics Standards Association 加拿大军用电子设备标准协会 |
| | CMF | | | [计] 音乐文件 |
| | CMG | | abbr. | 最低等级圣迈克尔和圣乔治勋爵(Companion of the Order of St Michael ＆ St George) |
| | CMH | | abbr. | Congressional Medal of Honor (美国)国会荣誉勋章 |
| | CMI | | | [计] 计算机管理教学 |
| | CMIP | | | [计] 公共管理信息协议 |
| | CMIS | | | [计] 坐标检测系统软件, 公共管理信息服务 |
| | CML | | | =Current-Mode Logic 电流型逻辑（电路） |
| | CMM | | | Controllable Memory Module 可控存储组件 |
| | CMMS | | | =Carbon Monoxide Measuring System 一氧化碳测量系统 |
| | CMMSSA | | | =Chemical Metallurgical and Mining Society of South Africa 南非化学、冶金及采矿学会 |
| | CMN | | | =Control Matrix Network 控制矩阵网络 |
| | CMO | | | =Central Meteorological Observatory 中央气象台 |
| | CMOS | | n. | [计]互补金属氧化物半导体 |
| | CMOS chip | | n. | [计]CMOS 芯片 |
| | CMP | | | Corrugated Metal Pipe 波纹金属管 |
| | CMR | | | Continuous Maximum Rating 最大连续功率 |
| | CMRR | | | =Common Mode Rejection Ratio 共态抑制比 |
| | CMS | | abbr. | Church Missionary Society(英国)教会传教士协会 |
| | CMT | | | Corrected Mean Temperature 修正平均温度 |
| | CMTC | | abbr. | Citizens'Military Training Camp (美国)国民军事训练营 |