| Acronym | Meaning |
| CBXT | Community-Based Clinical Trial |
| CC | Closed Cup (Flash Point Test Method) |
| CC | Close Coupling Method (for Atom-molecule Collisions) |
| CC | Combined Cycle |
| CC | Coupled Channel |
| CC | Coupled-cluster (quantum Calcn. Method) |
| CC-CI | Cluster Corrected-configuration Interaction |
| CC-CPA | Charge-correlated CPA |
| CC-DQMC | Clamped-coordinate Diffusion Quantum Monte Carlo |
| CC-EH | Coupled-cluster Effective Hamiltonian |
| CC-LRT | Coupled-cluster(-based) Linear Response Theory |
| CC-PV(D,T,Q) | Correlation-consistent Polarized (double, Triple, Or Quadruple)-split Valence Basis Set |
| CC-VTZ | Correlation Consistent-valence Triple Zeta (basis Set) |
| CC/RVDF | Codex Committee On Residues Of Veterinary Drugs In Food |
| CCA | Canonical Correspondence Analysis |
| CCA | Channel Coupling Array (quantum Theory For Atoms And Mols.) |
| CCA | Close-coupling Approximation |
| CCA | Convex Constraint Analysis |
| CCA | Copper Chromium Arsenic |
| CCA | Coupled-cluster Approach |
| CCA | Crystalline Cluster Approach (in Electronic Structure Calcns.) |
| CCA | Crystalline Colloidal Array |
| CCAA | Canadian Clean Air Act |
| CCAM | Charge-conserving Approxn. Method (for Quantum Calcns.) |
| CCAP | Cancer Chromosome Aberration Project |
| CCAP | Center For Clean Air Policy |
| CCAP | Climate Change Action Plan |
| CCAP | Crustacean Cardioactive Peptide |
| CCB | Calcium Channel Blocker |
| CCBA | Coupled-channel Born Approximation |
| CCBP | Coal Combustion By-product |
| CCC | Copyright Clearance Center |
| CCC | Calibration Check Compounds |
| CCC | Convergent Close Coupling |
| CCC | Correlated Coupled Cluster (quantum Calcn. Method) |
| CCC | Counter Current Chromatography |
| CCC | Critical Coagulant Concentration |
| CCCC | Complex-coordinate Coupled-channel (method In Calcns. On Rotational And Vibrational Predissocn.) |
| CCCI | Correlation-consistent CI |
| CCCLC | Complex-coordinate Coupled-Landau-channel (method In Calcns. On Autoionizing Resonances) |
| CCCO | Committee On Climatic Changes And The Ocean (of IOC And SCOR) |
| CCCTF | Core Conduction Cooldown Test Facility |
| CCD | Carbonate Compensation Depth |
| CCD | Charge Coupled Device |
| CCD | Chemical Composition Distribution [of Polymers] |
| CCD | Counter Current Decantation |
| CCD | Coupled-cluster Doubles |
| CCDC | Cambridge Crystallographic Data Center |
| CCDIS | Charge-coupled Device Imaging Spectrometer |
| CCDPPA | Coupled-cluster With Double Excitation Polarization Propagator |