| Abbreviation | Definition |
|---|---|
| CIPP | Critical Infrastructure Protection Program |
| CIQI | Clinical Investigator Qualification Information |
| CIR | Cosmetic Ingredient Review |
| CIRMS | Council on Ionizing Radiation Measurements and Standards |
| CIRS | Center Information Retrieval System |
| CIS | Cancer Information Service |
| CIS | Catastrophic Incident Supplement |
| CISET | Committee on International Science, Engineering, and Technology |
| CIT | Center for Information Technology |
| CJD | Creutzfeldt-Jakob Disease |
| CLA | conference lodging allowance |
| CLIA | Clinical Laboratory Improvement Amendments |
| CLIA | Clinical Laboratory Improvement Amendments of 1988 |
| CLSI | Clinical and Laboratory Standards Institute |
| CLT | Central Limit Theorem |
| CM | Case Management |
| CM | Chemistry and Manufacturing |
| CM | Committee Meeting |
| CMA | Chemical Manufacturers Association |
| CMC | Chemical Manufacturing Control |