| C | Carbon; Capacitance/Capacitor |
| C-band | 4-6 GHz (3.7-4.2 downlink, 5.925-6.425 uplink) |
| C/N | Carrier to Noise ratio |
| C3 | Command, Control and Communicate |
| C4 | Controlled Collapse Component Connection |
| Ca | Calcium |
| CA | CIM Architecture |
| CAA | CIM Applications Architecture |
| CAB | Competitive Analysis Benchmarking |
| CAD | Computer-Aided Design |
| CADT | Control Application Development tool |
| CAE | Computer-Aided Engineering |
| CAF | Controlled Ambient Facility; Cathotic Annodic Filaments |
| CAFM | Computer Aided Facilities Management |
| CAG | Competitive Analysis Group |
| CAGE | Commercial And Government Entity |
| CAI | Computer-Assisted Instruction |
| CAIBE | Chemically-Assisted Ion Beam Etching |
| CALS | Computer-Aided Logistics Support (Air Force Program) |
| CAM | Computer-Aided Manufacturing; Content Addressable Memory |
| CAPP | Computer Aided Process Planning |
| CAPS | Computer-Assisted Problem Solving |
| CAR | Computer-Aided Research; Computer-Aided Repair |
| CARRI | Computerized Assessment of Relative Risk Impacts |
| CASE | Computer-Aided Software Engineering; Computer-Aided Systems Engineering |
| CAT | Computer-Aided Testing; Conditional Access Table |
| CATV | Cable TV |
| CAW | Construction Analysis Workgroup |
| CAWC | Cryogenic Aerosol Wafer Cleaning |
| CB | Carbon Black; Conduction Band; Common Base configuration |
| CBA | Cell-Based Architecture |
| CBD | Convergent Beam Diffraction |
| CBE | Chemical Beam Epitaxy, aka MOMBE |
| CBED | Convergent Beam Electron Diffraction |
| CBGA | Ceramic Ball Grid Array |
| CBM | Conduction Band Minimum |
| CBS | Chemical Bottle Storage Area |
| CBT | Computer-Based Training |
| CC | Chip Carrier; Cluster Controller; Common Collector; Composite Capabilities |
| CCAPS | Circuit Assembly and Processing System |
| CCC | Ceramic Chip Carrier |
| CCD | Charge Coupled Device; Configuration Coordinate Diagram |
| CCSA | China Communications Standards Association |
| CCSL | Compatible Current-Sinking Logic |
| CCW | Counter ClockWise |
| Cd | Cadmium |
| CD | Critical Dimension; Compact Disc |
| CDA | Copper Development Association; Clean Dry Air |
| CDB | Cell Delineation Block device |
| CDE | Chemical Downstream Etch |
| CDEM | Customer Delivery Enterprise Model |
| CDI | Collector-Diffusion Isolation |
| CDM | Common Device Model for SAB |
| CDMA | Code Division Multiple Access (handsets) |
| CDO | Controlled Decomposition/Oxidation |
| CD/OL | Critical Dimension Overlay |
| CDR | Chemical Distribution Room; Compact Disc Rewriteable/Recordable; CorelDraw image format; Clock and Data Recovery |
| CDR | format; Clock and Data Recovery |
| CD-ROM | Compact Disc Read-Only Memory |
| Ce | Cerium |
| CE | Capillary Electrophoresis; Common Emitter |
| CEA | Constant Efficiency Amplifier; Consumer Electronics Association |
| CEC | Cell Evaluation Chip |
| CEE | Control Execution Environment |
| CEF | Crystal Electric Field |
| CEM | Continuous Emissions Monitoring |
| CEN | Comité Européen de Normalisation; European Committee for Standardization |
| centi | 1.00E-2 (1/100; symbolized by the prefix c) |
| CEPT | COMETS Equipment Performance Tracking |
| CER-DIP | CERamic Dual In-line Package |
| Cf | Californium |
| CFA | Component Failure Analysis |
| CFC | ChloroFluoroCarbon |
| CFD | Computational Fluid Dynamics |
| CFI | CAD Framework Initiative; Common Flash-memory Interface |
| CFM | Contamination-Free Manufacturing; Continuous Flow Manufacturing; Cubic Foot per Minute |
| CFMRC | Contamination-Free Manufacturing Research Center |
| CFP | Ceramic Flat Pack |
| CGA | Compressed Gas Association; Column Grid Array |
| CGBA | Ceramic Ball Grid Array |
| CGM | Computer Graphics Metafile image format |
| CHF | Critical Heat Flux |
| CHR | Communication History Report |
| CHTML | Compact Hypertext Markup Language |
| CI | Confidence Interval |
| CIC | Cleanroom Interface Chamber |
| CID | Charge-injection device |
| CIDf | Content ID form |
| CIE | Computer-Integrated Engineering |
| CIM | Computer-Integrated Manufacturing |
| CIM-OSA | Computer-Integrated Manufacturing-Open Systems Architecture (ESPRIT program) |
| CIP | Continuous Improvement Program |
| CIS | Center for Integrated Systems; Copper Indium Selenide |
| CISC | Complex Instruction Set Computer |
| CITIS | Contractor Integrated Technical Information Services |
| Cl | Chlorine |
| CL | CathodoLuminescence |
| CLC | Cancel Lot Cycle |
| CLCC | Ceramic Leaded Chip Carrier |
| CLIC | Closed-Loop Intensity Control |
| CLIW | Customized Long Instruction Word |
| CLP | Windows clipboard image format |
| Cm | Curium |
| CM | Configuration Management; Cassette Module |
| CMA | Cylindrical Mirror Analyzer |
| CMC | Cassette Module Controller; Copper Molly Copper |
| cmil | Circular mil |
| CML | Current Mode Logic |
| CMM | Capability Maturity Model |
| CMOS | Complementary Metal-Oxide Semiconductor |
| CMP | Chemical Mechanical Polishing |
| CMR | Common-Mode Rejection ratio; Cancel Move Request |
| CMS | Coordinate Measuring System; Content Management System |
| CMT | Cadmium Mercury Telluride; Chip Mounting Technology |
| CMTS | Cable Modem Termination System |
| CMTS | Cable Modem Termination System |
| CMUG | Cost Modeling Users Group |
| CMX | Corel clipart image format |
| CNC | Computer Numerical Control; Condensation Nucleus Counter |
| CNDO | Complete Neglect of Differential Overlap |
| CNS | Central Nervous System |
| Co | Cobalt |
| COB | Chip-On-Board |
| COC | Cost Of Consumables |
| COD | Consumed Oxygen Demand |
| CODEC | COder-DECoder |
| COFDM | Coded Orthogonal Frequency Division Multiplex |
| COFF | Universal format for binary files (not standard) |
| COFI | Codec Filter |
| COFISLIC | Codec Filter and Subscriber Line Interface Circuit |
| COGS | Cost Of Goods Sold |
| COED | Computer Optimized Experimental Design |
| COL | Characteristic Orange Luminescence |
| COM | Component Object Model |
| COO | Chief Operating Officer; Cost Of Ownership |
| COOL | Cost Of Ownership Luminator (Wright, Williams, & Kelly) |
| CORBA | Common Object Request Broker Architecture |
| CORE | Composite Object Reference |
| COSS | Common Object Services Specification |
| COT | Customer-Owned Tooling |
| CP | Process capability; Chip Place; Capability Performance |
| CP/M | Computer Program/Maintenance |
| CPA | Charged Particle Analysis |
| CPD | Contact Potential Differences; Concurrent product development; Common Path Distortion |
| CPE | Communications, Participation, and Education program; Customer Premises Equipment |
| CPGA | Ceramic Pin Grid Array |
| CPID | Common Path Intermodulation Distortion |
| CPK | Process capability index |
| CPL | Capability Performance, Lower |
| CPLD | Complex Programmable Logic Device |
| CPU | Central Processing Unit; Capability Performance, Upper |
| CQFP | Ceramic Quad Flat Pack |
| CQN | Closed-Queuing Network |
| Cr | Chromium |
| CR | Cyclotron Resonance |
| CRADA | Cooperative Research And Development Agreement |
| CRC | Cyclic Redundancy Check |
| CRID | Content Reference IDentifier |
| CRL | Certificate Revocation List |
| CRM | Cost/Resource Model; Consumer Relationship Management |
| CRO | Cathode Ray Oscilloscope |
| CRT | Cathode Ray Tube |
| Cs | Cesium |
| CSA | CIM Systems Architecture; Canadian Standards Agency; Conceil Supérieur de l'Audiovisuel |
| CSE | Control Systems Engineering Department |
| CSF | Critical Success Factor |
| CSG | Constructive Solids Geometry |
| CSIC | Customer Specific Integrated Circuit |
| CSL | Current-Steering Logic |
| CSMA/CD | Carrier-Sense, Multiple-Access/Collision Detection |
| CSP | Chip Scale Package |
| CSP | Chip Scale Package |
| CSPED | Concurrent Semiconductor Production and Equipment Development |
| CSR | Consumer Service Representative |
| CSS | Cascading Style Sheets language |
| CST | CIM Systems Technology |
| CSTR | Continuous Stirred Tank Reactor |
| CSU | Channel Service Unit |
| CSV | Comma-Separated Variable |
| CT | Cycle Time |
| CTC | Cluster Tool Controller; Counter Timer Circuit |
| CTE | Coefficient of Thermal Expansion |
| CTEM | Conventional Transmission Electron Microscopy |
| CTF | Contrast Transfer Function |
| CTI | Cycle Time Improvement |
| CTL | Complementary Transistor Logic |
| CTMC | Cluster Tool Modular Communications |
| Cu | Copper |
| CUB | Central Utility Building |
| CUBES | Capacity Utilization Bottleneck Efficiency System |
| CUI | Common User Interface |
| CUSUM | CUmulative Sum |
| CUT | Dr Halo image format |
| CV | Capacitance-to-Voltage; Curriculum Vitae |
| CVC | Chemical Vapor Cleaning |
| CVCM | Collected Volatile Condensable Materials |
| CVD | Chemical Vapor Deposition |
| CVS | Cyclic Voltammetry Stripping |
| CW | Continuous Wave; ClockWise |
| CWDM | Coarse Wavelength Division Multiplexing |
| CYM | CYcle Model |
| CZ | CZochralski Process |
| CZT | Cadmium Zinc Telluride |