| Abbreviation | Definition |
|---|---|
| CICA | Competition In Contracting Act |
| CICC | Cargo Integration Control Center |
| CICU | Computer Interface Conditioning Unit |
| CICU | Computer Interface Control Unit |
| CID | Charge Injection Device |
| CID | Computer Interface Device |
| CIDL | Configuration Item Data List |
| CIDR | Critical Intermediate Design Review |
| CIE | Communications Interface Equipment |
| CIE | Computer Interface Electronics |
| CIF | Central Instrumentation Facility |
| CIFS | Critical Initial Flaw Size |
| CIG | Cable Integrity Group |
| CIG | Communications and Interface Group |
| CIL | Critical Items List |
| CIM | Computer Input Multiplexer |
| CIMS | Cyber Identity Management System |
| CIN | Center Information Network |
| CINDAS | Center for Information and Numerical Data Analysis and Synthesis |
| CIO | Chief Information Officer |