| Abbreviation | Definition |
|---|---|
| CCSIL | Command and Control Simulation Interface Language |
| CCSS | Chinese Character Synthesis System |
| CCSUG | Call Center Studio Users Group |
| CCTA | Central Computer and Telecommunications Agency |
| CCTLD | Country Code Top-Level Domain |
| CCU | Communication Control Unit |
| CCW | Channel Command Word |
| CD | Change Directories |
| CD | Change Directory |
| CDAC | Center for Development of Advanced Computing |
| CDAM | Computer Data Analysis and Modeling |
| CDB | Command Descriptor Block |
| CDC | Century Date Change |
| CDD | Compact Disc Driver |
| CDDA | Compact Disc Digital Audio |
| CDDA | Compact Disk Digital Audio |
| CDDB | Compact Disc Data Base |
| CDDI | Copper Data Distribution Interface |
| CDE | Cadkey Dynamic Extension |
| CDE | Common Desktop Environment |