| C | Capacitance or capacitor |
| C | Carbonc |
| c | Centi (10-2) |
| C | Centigrade. |
| c | Speed of light in vacuum |
| C & W | Cable and Wireless |
| C (Q) | Coulomb |
| CA | CIM Architecture |
| CAA | CIM Applications Architecture |
| CAD | Command Area Development |
| CAD | Computer Aided Designing. |
| CADT | Control Application Development tool |
| CAE | Computer-Aided Engineering |
| CAF | Cathotic Annodic Filaments |
| CAFM | Computer Aided Facilities Management |
| CAG | Competitive Analysis Group |
| CAI | Computer-Assisted Instruction |
| CAIBE | Chemically-Assisted Ion Beam Etching |
| CALS | Computer-Aided Logistics Support (Air Force Program) |
| CAM | Computer aided manufacture |
| CAM | Conditional Access Module. |
| CAM | Content Addressable Memory |
| CAN | Control Area Network. |
| CAPP | Computer Aided Process Planning |
| CAPS | Computer-Assisted Problem Solving |
| CAR | Computer-Aided Repair |
| CAR | Computer-Aided Research |
| CARRI | Computerized Assessment of Relative Risk Impacts |
| CASE | Computer-Aided Software Engineering |
| CASE | Computer-Aided Systems Engineering |
| CAT | Career Aptitude Test. |
| CAT | Computer-Aided Testing |
| CAT | Computerized Axial Tomography. |
| CAT | Conditional Access Table |
| CATV | Cable TV |
| CATV | Community Access TeleVision |
| CAW | Construction Analysis Workgroup |
| CAWC | Cryogenic Aerosol Wafer Cleaning |
| CB | Citizen's band |
| CB | Common base configuration |
| CB | Conduction Band |
| CBA | Cell-Based Architecture |
| CBCPW | Conductor Backed CoPlanar Waveguide |
| CBD | Convergent Beam Diffraction |
| CBED | Convergent Beam Electron Diffraction |
| CBGA | Ceramic Ball Grid Array |
| CBM | Conduction Band Minimum |
| CBT | Computer-Based Training |
| CC | Chip Carrier |
| CC | Common collector |
| CC | Composite Capabilities |
| CCA | Circuit Card Assembly |
| CCAPS | Circuit Assembly and Processing System |
| CCC | Ceramic Chip Carrier |
| CCD | Charge Coupled Device |
| CCD | Configuration Coordinate Diagram |
| CCK | Complimentary Code Keying. |
| CCSA | China Communications Standards Association |
| CCSL | Compatible Current-Sinking Logic |
| CCW | Counter ClockWise |
| CD | Compact Disc. |
| CD | Critical Dimension |
| CDA | Clean Dry Air |
| CDAC | Centre of Development of Automatic Computing. |
| CDB | Cell Delineation Block device |
| CDE | Chemical Downstream Etch |
| CDEM | Customer Delivery Enterprise Model |
| CDI | Collector-Diffusion Isolation |
| CDMA | Code Division Multiple Access |
| CDO | Controlled Decomposition/Oxidation |
| CDPD | Cellular Digital Packet Data |
| CDR | Clock and Data Recovery |
| CDR | Compact Disc Rewriteable/Recordable |
| CDR | CorelDraw image format |
| CD/OL | Critical Dimension Overlay |
| CE | Common Emitter |
| CE | Consumer Electronics. |
| CEA | Constant Efficiency Amplifier |
| CEA | Consumer Electronics Association |
| CEC | Cell Evaluation Chip |
| CEE | Control Execution Environment |
| CEF | Crystal Electric Field |
| CEM | Continuous Emissions Monitoring |
| CEPT | COMETS Equipment Performance Tracking |
| CF | Calibration Factor |
| CFA | Component Failure Analysis |
| CFA | Cross-Field Amplifier |
| CFC | ChloroFluoroCarbon |
| CFD | Computational Fluid Dynamics |
| CFI | CAD Framework Initiative |
| CFI | Common Flash-memory Interface |
| CFL | Compact Flourscent Lamps. |
| CFM | Contamination-Free Manufacturing |
| CFM | Continuous Flow Manufacturing |
| CFMRC | Contamination-Free Manufacturing Research Center |
| CFP | Ceramic Flat Pack |
| CGA | Column Grid Array |
| CGI | Common Gateway Interface. |
| CGM | Computer Graphics Metafile image format |
| CHF | Critical Heat Flux |
| CHR | Communication History Report |
| CHTML | Compact Hypertext Markup Language |
| 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) |
| CIS | Center for Integrated Systems |
| CISC | Complex Instruction Set Computers. |
| CITIS | Contractor Integrated Technical Information Services |
| CL | CathodoLuminescence |
| CLCC | Ceramic Leaded Chip Carrier |
| CLIC | Closed-Loop Intensity Control |
| CLIW | Customized Long Instruction Word |
| CLP | Windows clipboard image format |
| CM | Cassette Module |
| CM | Configuration Management |
| CMC | Cassette Module Controller |
| CMC | Copper Molly Copper |
| CML | Current Mode Logic |
| CMM | Capability Maturity Model |
| CMOS | Complimentary Metal Oxide Semiconductor. |
| CMP | Chemical Mechanical Polishing |
| CMRR | Common Mode Rejection Ratio. |
| CMS | Content Management System |
| CMS | Coordinate Measuring System |
| CMT | Chip Mounting Technology |
| CMTS | Cable Modem Termination System |
| CMUG | Cost Modeling Users Group |
| CMX | Corel clipart image format |
| CNC | Computer Numerical Control |
| CNC | Condensation Nucleus Counter |
| CNR | Carrier to Noise Ratio (C/N) |
| CNS | Central Nervous System |
| COB | Chip-On-Board |
| COC | Cost Of Consumables |
| COD | Consumed Oxygen Demand |
| CODEC | COder-DECoder |
| COE | Center Of Excellence |
| COED | Computer Optimized Experimental Design |
| COFDM | Coded Orthogonal Frequency Division Multiplex |
| COFI | Codec Filter |
| COFISLIC | Codec Filter and Subscriber Line Interface Circuit |
| COGS | Cost Of Goods Sold |
| COL | Characteristic Orange Luminescence |
| COM | Component Object Model |
| COMSAT | Communications sattelite corporation. |
| COO | Cost Of Ownership |
| CORBA | Common Object Request Broker Architecture |
| CORE | Composite Object Reference |
| COSS | Common Object Services Specification |
| COT | Customer-Owned Tooling |
| COTS | Commercial Off The Shelf |
| CP | Capability Performance |
| CP | Chip Place |
| CP | Circularly Polarized |
| CPA | Charged Particle Analysis |
| CPD | Common Path Distortion |
| CPD | Concurrent product development |
| CPD | Contact Potential Differences |
| CPE | Communications, Participation, and Education program |
| CPE | Customer Premises Equipment |
| CPGA | Ceramic Pin Grid Array |
| CPID | Common Path Intermodulation Distortion |
| CPLD | Complex Programmable Logic Devices. |
| CPRM | Content Protection for Recoverable Media. |
| CPS | Co-Planar Stripline |
| CPT | Colour Picture Tube. |
| CPW | Co-Planar Waveguide |
| CP/M | Computer Program/Maintenance |
| CQFP | Ceramic Quad Flat Pack |
| CQN | Closed-Queuing Network |
| CR | Cyclotron Resonance |
| CR | Junction diode |
| CRADA | Cooperative Research And Development Agreement |
| CRC | Cyclic Redundancy check. |
| CRID | Content Reference IDentifier |
| CRL | Certificate Revocation List |
| CRM | Consumer Relationship Management |
| CRM | Cost/Resource Model |
| CRO | Cathode Ray Oscilloscope. |
| CRT | Cathode Ray Tube |
| CSA | Canadian Standards Agency |
| CSA | CIM Systems Architecture |
| CSE | Control Systems Engineering Department |
| CSG | Constructive Solids Geometry |
| CSIC | Customer Specific Integrated Circuit |
| CSL | Current-Steering Logic |
| CSMA/CD | Carrier-Sense, Multiple-Access/Collision Detection |
| CSO | Composite Second Order |
| 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 | Computer Tomography. |
| CT | Curve Tracing |
| CT | Cycle Time |
| CT | Total capacitance |
| CTB | Composite Triple Beat |
| 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 |
| CTV | Colour Tele Vision. |
| 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 |
| CV.C | Chemical Vapor Cleaning |
| CVCM | Collected Volatile Condensable Materials |
| CV.D | Chemical Vapor Deposition |
| CV.S | Cyclic Voltammetry Stripping |
| CW | ClockWise |
| CW | Continuous transmission |
| CW | Continuous Wave |
| CWDM | Coarse Wavelength Division Multiplexing |
| CY.M | CYcle Model |
| C/N | Carrier to Noise ratio |
| C3 | Command, Control and Communicate |
| C4 | Controlled Collapse Component Connection |
| Cd | Cadmium |
| CD-ROM | Compact Disc Read-Only Memory |
| CER-DIP | CERamic Dual In-line Package |
| cm | Centimeter |
| cmil | Circular mil |
| CRT | Cathode ray tube |
| CT | Total capacitance |
| Cu | Copper |
