| Société mathématique du Canada | Academic & Science |
| Canadian Mathematical Society | Academic & Science |
| Clay Minerals Society | Academic & Science |
| Kupriakē Mathēmatikē Etaireia | Academic & Science |
| Cyprus Mathematical Society | Academic & Science |
| Κυπριακή Μαθηματική Εταιρεία | Academic & Science |
| 中国数学会 | Academic & Science |
| Zhōngguó Shùxuéhuì | Academic & Science |
| Curriculum Management System | Academic & Science |
| Chicago Manual of Style | Academic & Science |
| Clinton-Macomb Public Library, South Branch | Academic & Science |
| Center of Migration Studies | Academic & Science |
| Colorado Medical Society | Academic & Science |
| Comparative Media Studies | Academic & Science |
| Condition Monitoring System | Academic & Science |
| Credit Management System | Accounts and Finance |
| Cost Management System | Accounts and Finance |
| Scusciuban | Airport Code |
| Chief marketing offcer | Business |
| Content Management SystemC | Business |
| Complaint Management System | Business |
| Constant Maturity Swap | Business |
| Commercial Mortgage Securities | Business |
| Classic Movie Shop | Business |
| CMS Energy Corporation (formerly Consumers Power Company) | Business |
| Central Material Services | Business |
| Chinese Mathematical Society | Business |
| Claremont Mudd Scripps | Business |
| Contest Management System | Business |
| Communication Media Services | Business |
| Communisis | Business |
| Compensation Management Specialist | Business |
| Cash Management Services | Business |
| Contact Management System | Business |
| Central Management Services | Business |
| Claims Management Services | Business |
| Chiropractic Management Systems | Business |
| Custom Manufacturing Services | Business |
| Consultant Management System | Business |
| Customer Management Strategy | Business |
| Corporate Management System | Business Management |
| Calibration Management System | Business Management |
| Common Management System | Business Management |
| Cupcake Management System | Business Management |
| Customs Management System | Business Management |
| Call Management System | Business Management |
| Collateral Management System | Business Management |
| Center for Materials Simulation | Chemistry |
| Califf Middle School | Community |
| Chamber Music Society | Community |
| Charlotte Mecklenburg Schools | Community |
| Canberra Multicultural Service | Community |
| Center for Medicare Services | Community |
| Central Magnet School | Community |
| Compact Music System | Community |
| Church Management System | Community |
| College Music Society | Community |
| Conference Management System | Community |
| Call Management Server | Computer and Networking |
| Call Management Signaling | Computer and Networking |
| Circuit Multiplication System | Computer and Networking |
| Clustered Mailbox Server | Computing |
| Cable Modems | Computing |
| Central Management System | Computing |
| Continuous Management Service | Computing |
| Circuit Maintenance System | Computing |
| Communications Management Subsystem | Computing |
| Control Message Service | Computing |
| Code Morphing Software | Computing |
| Cable Management System | Computing |
| Classic Mole Style | Computing |
| Certificate Management Service | Computing |
| Card Management System | Computing |
| Concurrent Mark Sweep | Computing |
| Cryptographic Message Syntax | Computing |
| Color Matching System | Computing |
| Content Management Server | Computing |
| Compiler Monitor System | Computing |
| Configuration Management System | Computing |
| Computer Management System | Computing |
| Cisco Cluster Management Suite | Computing |
| Course Management System | Computing |
| Central Management Server | Computing |
| Candle Management Server | Computing |
| College Management System | Educational Institute |
| College of Martial Science | Educational Institute |
| Coordinate Measuring System | Electronics |
| Circulation Motor Sensory | General |
| Center for Migration Studies | General |
| Carbogenic Molecular Sieves | General |
| Carbon Monitoring System | General |
| Complicating My Sh*t | General |
| Core Mission System | General |
| Criticom Monitoring Services | General |
| Content Mangement System | General |
| Collision Mitigation System | General |
| Cornish Motorcycle Salvage | General |
| Collision Mitigation Sensor | General |
| Chieftec Modul System | General |
| Crash Management System | General |
| Composition Media System | General |
| Charlotte Motor Speedway | General |
| Changeable Message Signs | General |
| Classic Motor Show | General |
| Catalyst Monitor Sensor | General |
| Current Models and Services | General |
| Charge Management System | General |
| Collision Management System | General |
| Congestion Management System | General |
| Camera Monitor System | General |
| C Messaging Service | General |
| Centimeters | General |
| Circulation Motion Sensation | General |
| Cabernet, Merlot, and Syrah | General |
| Complete Mess Situation | General |
| Custom Menu System | General |
| Cab Merlot And Syrah | General |
| Cabernet Merlot Syrah | General |
| Content Managment System | General |
| Car Mechanic Simulator | General |
| C Marine Scape | General |
| Camera Mirror Replacement System | General |
| Common Message Switch | General |
| Citywide Mobility Survey | General |
| Commercial Motor Show | General |
| Chengdu Motor Show | General |
| Ceylon Motor Show | General |
| Colombo Motor Show | General |
| Car Marketing System | General |
| Camaro Ls | General |
| Certified Medical Secretary | General |
| Complete Matched Set | General |
| Clay Metamorphic Servant | General |
| Compact Muon Selenoid | General |
| Consumer Metering Station | General |
| Coordinate Measurement System | General |
| Made Simple | General |
| Convention on Migratory Species | General |
| Central Maintenance System | General |
| Cabin Management System | General |
| Crew Management System | General |
| Colonies Military Service | Governmental |
| Center Mounted Shifter | Governmental |
| CoMmunist pro-Soviet | Governmental |
| Changeable Message Sign | Governmental |
| Centres for Medicare & Medicaid Services | Governmental |
| Chaos, Misery, and Suffering | Governmental |
| Centers for Medicare and Medicaid Services (formerly Health Care Financing Administration) | Governmental |
| Children's Medical Services | Governmental |
| Center for Medicare & Medicaid Services | Governmental |
| Correctional Medical Services | Governmental |
| Central Marine Services | Governmental |
| Case Management System | Governmental |
| Central Monitoring Service | Governmental |
| Centers for Medicare and Medicaid Services (DHHS) (formerly HCFA) | Governmental |
| Centers for Medicare & Medicaid Services (prev. HCFA) | Governmental |
| Centers for Medicare & Medicaid Services | Governmental |
| HHS Centers for Medicare and Medicaid Services | Governmental |
| Centers for Medicare and Medicaid Services | Healthcare |
| Content Management System | Information Technology |
| Conventia privind Conservarea speciilor Migratoare de animale Salbatice - Bonn | International |
| Centers for Medical Services | Medical |
| Canters for Medicaid’s and Medicare Services | Medical |
| Congenital Myasthenic Syndrome | Medical |
| Center for Medical Services | Medical |
| Chiari malformations | Medical |
| CardioMyopathy Syndrome | Medical |
| Chorioamniotic Membrane Separation | Medical |
| Chronic Maxillary Sinusitis | Medical |
| Clinical Management Support | Medical |
| Clinical Management System | Medical |
| Community Midwifery Service | Medical |
| Complement-Mediated Solubilisation | Medical |
| Congenital Mitral Stenosis | Medical |
| Congenital Myasthenic Syndromes | Medical |
| Contract Management System | Medical |
| Chief Master Sergeant | Military and Defence |
| Counter-mine System | Military and Defence |
| Cockpit Management System | Military and Defence |
| Community Management Staff | Military and Defence |
| Comsec (communications Security) Materiel System | Military and Defence |
| Contingency Mutual Support | Military and Defence |
| Communications Management System | Military and Defence |
| Crisis Management System | Military and Defence |
| Combat Mission Simulator | Military and Defence |
| Container Management System | Military and Defence |
| Court-martialled and Shot | Military and Defence |
| Conversational Monitor System | Military and Defence |
| Central Monitoring Station | Networking |
| Corporate Messaging Solution | Networking |
| Compact Muon Solenoid | Physics Related |
| Church Missionary Society | Regional |
| Church Mission Society | Society & Culture |
| Content Management Software | Softwares |
| Conversation Monitoring System | Softwares |
| Content Management Systems | Softwares |
| Color Management System | Softwares |
| Competency Management System | Space Science |
| Cambridge Monitoring System (computer Program) | Space Science |
| Command Management System | Space Science |
| Chronic Mountain Sickness | Sports |
| Creator Management System | Stock Exchange |
