| C | C (ANSI) | |
| C Beautifier | C Language Integrated Production System | C preprocessor |
| C Programmer’s Disease | C sharp | C shell |
| C with Classes | C# | C* |
| C++ | C++Linda | C++SIM |
| C+- | C+@ | C-10 |
| C-BC | C-Interp | C-Linda |
| C-odeScript | C-Prolog | C-Refine |
| C-Scheme | C/ATLAS | C/C++ |
| C/SCSC | C1 security | C2 security |
| c2man | c386 | C5 |
| C64 | c68 | CA |
| ca | CA-Telon | cable modem |
| cache | cache block | cache coherency |
| cache conflict | cache consistency | cache hit |
| cache line | cache memory | cache miss |
| Cache On A STick | caching | CACI |
| CACM | CAD | CAD/CAM |
| CADD | Cadence Design Systems | CADET |
| CADRE | CAE | CAF |
| CAFE | CAGE | CAI |
| Cairo | CAIS | CAIS-A |
| CAiSE | CAJOLE | CAL |
| Calc | calculator | Calculus of Communicating Systems |
| Calendar API | Calendar Application Programming Interface | Caliban |
| Calico | California State University San Marcos | Call Unix |
| call-by-name | call-by-need | call-by-reference |
| call-by-value | call-by-value-result | Call-Level Interface |
| call-with-current-continuation | call/cc | callback |
| callee | Caller ID | calling convention |
| Callware | CALS | CAM |
| CAM-6 | CAM-PC | CAMAL |
| Cambridge Lisp | Camelot Library | camera ready |
| CAMIL | CAML | Caml Light |
| Campus Wide Information System | CAN | can’t happen |
| Canada | Cancel | Cancelbunny |
| Cancelm00se | Cancelmoose | Cancelpoodle |
| candidate key | Candle | candygrammar |
| canonical | Canonical Encoding Rules | canonical name |
| canonicity | Cantor | CAP |
| Cap’n Crunch | Capabilities Maturity Model | capability |
| Capability Maturity Model | capacitor | capacity |
| CAPI | Captain Abstraction | Captain Crunch |
| card | card walloper | Cardbox for Windows |
| Cardbus | cardinal number | cardinality |
| CARDS | Career Limiting Move | caret |
| careware | cargo cult programming | Caribou CodeWorks |
| Carl Friedrich Gauss | Carnegie Mellon University | carpal tunnel syndrome |
| Carriage Return | carrier scanner | carrier signal |
| Carrierless Amplitude/Phase Modulation | Cartesian coordinates | Cartesian product |
| CAS | CAS 8051 Assembler | cascade |
| Cascading Style Sheets | CASE | case |
| case and paste | case based reasoning | CASE Data Interchange Format |
| CASE framework | case insensitive | Case Integration Services |
| case sensitive | case sensitivity | CASE SOAP III |
| case statement | CASE tools | CASE*Method |
| cashe | CAST | cast |
| casters-up mode | casting the runes | CAT |
| cat | Cat 3 | Cat 5 |
| catatonic | CATE | Categorical Abstract Machine Language |
| category | Category 3 | Category 5 |
| cathode ray tube | CATIA | cationic cocktail |
| CATNIP | CATO | Cauchy sequence |
| cause-effect graphing | CAV | Cayenne Software |
| CAYLEY | cb | CBASIC |
| CBD | CBIR | CBN |
| CBR | CBT | CBV |
| cbw | cc | CC++ |
| cc:mail | CCalc | CCD |
| CCIRN | CCITT | CCITT HIgh-Level Language |
| CCL | CCLU | ccmail |
| CCP | CCR | CCS |
| CCSP | CCTA | CD |
| cd | cd tilde | CD-i |
| CD-R | CD-Read-Write | CD-Rewritable |
| CD-ROM | CD-ROM drive | CD-RW |
| CDA | CDC | CDD/Plus |
| CDDI | CDE | CDF |
| CDIF | CDL | CDM |
| CDMA | CDP1802 | CDPD |
| cdr | CDS | CE |
| Cecil | Cedar | CEEMAC+ |
| CEI-PACT | Celeron | CELIP |
| cell | Cellang | CELLAS |
| Cello | CELLSIM | Cellular |
| cellular automata | cellular automaton | Cellular Digital Packet Data |
| cellular multiprocessing | Cellular Neural Network | CELP |
| CEN | CENELEC | centi-call second |
| central office | Central office exchange service | central processing unit |
| Centrex | Centronics | Centrum voor Wiskunde en Informatica |
| centum call second | century meltdown | cepstra |
| cepstrum | CEPT | CER |
| Ceramic Pin Grid Array | Ceres workstation Oberon System | Cerf, Vint |
| CERN | CERNLIB | CERT |
| Certificate Authority | CESP | CESSL |
| cextract | cf | CFD |
| CFML | cforth | cfortran.h |
| CFP | CFP92 | cg |
| CGA | CGGL | CGI |
| CGI Joe | CGI program | CGI script |
| cgi-bin | CGM | CGOL |
| cgram | Ch | ch |
| chad | chad box | Chadless keypunch |
| chain | Challenge-Handshake Authentication Protocol | Chalmers University of Technology |
| chan op | change management | changeover |
| channel | channel hopping | channel op |
| channel service unit | channel service unit/data service unit | chaos |
| CHAP | char | character |
| character encoding | character encoding scheme | character graphics |
| character key | character repertoire | character set |
| character set identifier | characteristic function | Charge-Coupled Device |
| CHARITY | charityware | Charles Babbage |
| Charles Simonyi | CHARM | CHARM++ |
| Charme | CHARYBDIS | chase pointers |
| CHASM | chat | chat room |
| chatbot | chatterbot | cheapernet |
| checkdigit | Checkout Test language | checkpoint |
| checksum | chemist | Chen |
| CHEOPS | Chernobyl packet | chess |
| CHI | Chicago | chicken head |
| chicklet keyboard | chiclet keyboard | Chief Information Officer |
| child | child process | child record |
| child version | CHILI | CHILL |
| Chimera | chine nual | Chinese Army technique |
| CHIP | chip | chip box |
| Chip Jewelry | Chip Scale Packaging | chip set |
| CHIP-48 | CHIP-8 | Chips & Technologies |
| CHISEL | chm | chmod |
| CHOCS | choke | chomp |
| CHOP | Chop | Chorus |
| Christmas tree | Christmas tree packet | Christopher Strachey |
| chromatic number | chrome | chroot |
| CHRP | chug | chunker |
| Church integer | Church of the SubGenius | Church, Alonzo |
| Church-Rosser Theorem | ci | CI$ |
| CICERO | Cichlid | CICS |
| CID | CIDR | CIEL |
| CIF | CIFS | Cigale |
| CIL | CIM | CIMS PL/I |
| Cinderella Book | CINT92 | CIO |
| CIP-L | ciphertext | CIR |
| CIRCAL | circuit | CIRcuit CALculus |
| circuit switched | circuit switching | circular buffer |
| Cirrus Logic | CIS | CISC |
| Cisco Systems, Inc. | CISI | CITRAN |
| CityScape | CIX | CJK |
| CJKV | ck | CL |
| cl | CLAM | Clarify |
| Clarion | Claris | CLASP |
| class | class hierarchy | class library |
| class method | Class Oriented Ring Associated Language | Class-Relation Method |
| classic | Classic C | Classic-Ada |
| classical logic | Classless Inter-Domain Routing | Clausal Language |
| clause | Clean | clean |
| Cleanroom | CLEAR | clear box testing |
| CLEO | CLHEP | CLI |
| CLiCC | click | client |
| Client To Client Protocol | client-server | Client-Server Analyst Programmer |
| client-server model | client/server | CLIP |
| CLiP | clipboard | Clipper |
| CLIPS | clique | CLISP |
| Clive Sinclair | CLIX | CLM |
| CLNP | clobber | clock |
| clock rate | clock speed | clone |
| clone-and-hack coding | clonebot | CLOS |
| Clos network | closed set | closed term |
| closed-box testing | closure | closure conversion |
| Clover | clover key | cloysism |
| CLP | CLP(R) | CLP(sigma*) |
| CLP* | CLR | CLtL1 |
| CLtL2 | CLU | clu2c |
| cluster | Cluster 86 | clustergeeking |
| clustering | CLUT | CLV |
| CLX | CM | cm |
| CMA | CMAY | CMC |
| CMGA | CMIP | CMIS |
| CML | CMM | CMOS |
| CMP | CMS | CMS-2 |
| CMU | CMU CL | CMU Common Lisp |
| CMVC | CMYK | CMZ |
| cn | CNAME | CNC |
| CNET | CNI | CNN |
| CNRI | co | co-location |
| Co-NP | Co-operative Development Environment | CO2 |
| Coad/Yourdon | COALA | coalesced sum |
| Coalition for Networked Information | coarse grain | COAST |
| coax | coaxial cable | COBOL |
| COBOL fingers | COBOL-1961 Extended | COBRA |
| cobweb site | Cocktail | cocktail shaker sort |
| CoCo | Coco Language | Coco/R |
| Cocol | Cocol/R | COCOMO |
| CODASYL | Codd’s First Normal Form | Codd’s reduction algorithm |
| code | Code 2.0 | Code Division Multiple Access |
| code division multiplexing | code grinder | code management |
| code police | code position | code segment |
| code walk | codebook | CODEC |
| CodeCenter | coded character set | coder/decoder |
| codes | codewalker | CODIL |
| codomain | coefficient of X | coercion |
| COFF | COGENT | Cogent Prolog |
| Cognitech | cognitive architecture | COGO |
| Coherent Parallel C | COHESION | COIF |
| cokebottle | COLASL | COLD |
| cold boot | COLD-K | ColdFusion |
| ColdFusion Markup Language | COLINGO | collision |
| collision detection | collocation | colon |
| color | Color Graphics Adapter | color model |
| Colossus | colour | colour depth |
| colour look-up table | colour model | colour palette |
| Columbia AppleTalk Package | Column Address Strobe | COM |
| com | com port | COMAL |
| combination | combinator | combinatory logic |
| Comdex | COME FROM | COMIS |
| COMIT | COMIT II | Comite Europeen des Postes et Telecommunications |
| comm mode | Comma | comma |
| comma separated values | command | Command Control Processor |
| command interpreter | command key | command line interface |
| command line option | command-line interpreter | COMMEN |
| comment | comment out | commercial at |
| Commercial Internet eXchange | Commercial Translator | Commodore 1010 |
| Commodore 128 | Commodore 1541 | Commodore 1570 |
| Commodore 1571 | Commodore 1581 | Commodore 64 |
| Commodore 64DX | Commodore 65 | Commodore Business Machines |
| Commodore SX64 | COMmon Algorithmic Language | Common Applications Environment |
| Common Applications Service Element | Common Architecture for Next Generation Internet P | COmmon Business Oriented Language |
| common carrier | Common Command Set | Common Communication Services |
| Common Desktop Environment | Common ESP | Common Gateway Interface |
| Common Hardware Reference Platform | Common Information Model | Common Intermediate Format |
| Common Intermediate Language | Common Internet File System | Common ISDN Application Programming Interface |
| Common Lisp | Common LISP in Parallel | Common LISP Object System |
| Common Management Information Protocol | Common Management Information Services | Common Object File Format |
| Common Object Model | Common Object Request Broker Architecture | Common Objects |
| Common Program Interface | Common User Access | Common-ISDN-API |
| CommonLoops | Commonwealth Hackish | Communicating Functional Processes |
| Communicating Sequential Processes | communication system | Communications Decency Act |
| Communications of the ACM | communications port | Communications Server |
| communications software | Community of Massive Gaming Agency | COMNET |
| compact | Compact COBOL | Compact Disc |
| Compact Disc interactive | Compact Disc Read-Only Memory | Compact Disc Read-Write |
| Compact Disc Recordable | Compact Disc Rewritable | compaction |
| compactness preserving | Compaq Computer Corporation | Compas Pascal |
| COMPASS | compatibility | compatible |
| Compatible Timesharing System | Compel | Competitive Access Provider |
| Compiled HTML | compiler | compiler compiler |
| compiler jock | Compiler Language for Information Processing | Compiler Target Language |
| Compiler-Compiler | compiler-compiler | COMPL |
| complement | Complementary Metal Oxide Semiconductor | complementary nondeterministic polynomial |
| complete | complete graph | complete inference system |
| complete lattice | complete metric space | complete partial ordering |
| complete theory | complete unification | completeness |
| Complex Instruction Set Computer | complex number | complex programmable logic device |
| complexity | complexity analysis | complexity class |
| complexity measure | component | component architecture |
| component based development | Component Integration Laboratories | Component Object Model |
| composite | composition | Compositional C++ |
| Compound Document Architecture | compound key | COMPREHENSIVE |
| Comprehensive Perl Archive Network | Comprehensive TeX Archive Network | compress |
| Compressed SLIP | compressed video | compression |
| COMPROSL | Compu$erve | Compulink Information eXchange |
| CompuServe Corporation | CompuServe Information Service | Compusult Ltd. |
| computability theory | computable | Computational Adequacy Theorem |
| computational complexity | computational geometry | computational learning |
| COMpute ParallEL | compute server | Computer |
| computer | Computer + Science NETwork | Computer Aided Design |
| Computer Aided Engineering | Computer Aided Software Engineering | Computer Animation Movie Language |
| Computer Associates International, Inc. | Computer Compiler | computer confetti |
| Computer Conservation Society | computer crime | Computer Design Language |
| computer dictionary | Computer Emergency Response Team | computer ethics |
| computer geek | Computer Generation Incorporated | Computer Graphics Metafile |
| Computer Integrated Manufacturing | computer language | computer law |
| computer literacy | Computer Management Group of Australia | Computer Mediated Communication |
| computer nerd | computer network | Computer Output to Laser Disk |
| Computer Professionals for Social Responsibility | computer program | computer security |
| computer sex | Computer Software Configuration Item | Computer Supported Cooperative Work |
| Computer Telephone Integration | Computer Telephony | Computer Telephony Integration |
| computer virus | computer vision | Computer-Aided Instruction |
| Computer-Aided Learning | Computer-Aided Software Testing | Computer-Assisted Learning |
| Computer-Assisted Software Engineering | Computer-Based Training | computer-generated imagery |
| computing | Computing Devices Canada Ltd. | computing dictionary |
| computron | Compuware Corporation | COMSL |
| COMTRAN | con | ConC |
| concatenate | concatenated key | concentrator |
| conceptualisation | Concert/C | ConCoord |
| concrete class | Concrete Data Structure | concrete syntax |
| CONCUR | concurrency | Concurrent C |
| Concurrent C++ | Concurrent Clean | Concurrent CLU |
| Concurrent Constraint Programming | Concurrent Euclid | Concurrent LISP |
| Concurrent Massey Hope | Concurrent ML | Concurrent Oberon |
| Concurrent Object-Oriented C | Concurrent Object-Oriented Language | Concurrent Pascal |
| Concurrent Prolog | Concurrent Scheme | Concurrent SP/k |
| ConcurrentSmalltalk | condela | condition out |
| condom | Conference On DAta SYstems Languages | Conferencing over IP |
| confidence test | CONFIG.SYS | configuration item |
| configuration management | configuration programming | conflation |
| ConflictNet | congestion | CONIC |
| conjunction | Conjunctive Normal Form | connect |
| connected graph | connected subgraph | Connection Machine LISP |
| connection-oriented | connection-oriented network service | connectionless protocol |
| connective | connector conspiracy | CONNIVER |
| CONS | cons | conservative evaluation |
| considered harmful | consistently complete | console |
| console jockey | Consortium for Lexical Research | constant angular velocity |
| constant applicative form | constant folding | constant linear velocity |
| constant mapping | Constantine/Yourdon | constraint |
| constraint functional programming | Constraint Handling In Prolog | Constraint Logic Programming |
| constraint satisfaction | ConstraintLisp | CONSTRAINTS |
| constructed type | constructive | Constructive Cost Model |
| constructive solid geometry | constructor | Consul |
| consultant | container class | content addressable memory |
| Content Data Model | content-based information retrieval | content-free |
| contention slot | context | context clash |
| context switch | context-free | context-sensitive menu |
| Contextually Communicating Sequential Processes | continental drift | continuation |
| Continuation Passing Style | continuation passing style | continuations |
| continuous function | Continuous System Modeling Program | Continuous System Simulation Language |
| continuous wave | contract programmer | contraction |
| control | Control and Status Register | control code |
| control flow | Control Language | Control Program |
| Control Program for Microcomputers | control structure | control tty |
| control unit | control-C | control-G |
| control-O | control-Q | control-S |
| controller | conventional memory | Convergent Technologies |
| Convergent Technologies Operating System | Conversational LISP | Conversational Monitor System |
| converse | conversion to iteration | CONVERT |
| convert.f90 | Convex Computer Corporation | convex hull |
| Conway’s Law | Conway’s Life | Conway, John Horton |
| cooC | cooccurrence matrix | cookbook |
| cooked mode | cookie | cookie bear |
| cookie file | cookie jar | cookie monster |
| cooky | COOL | CooL |
| COOL:Gen | Cooperative Information System | cooperative multitasking |
| coordinate | Coordinated Universal Time | Coordinating Committee for Intercontinental Resear |
| coordination language | copious free time | copper |
| Copper Distributed Data Interface | coprocessor | copy and paste |
| copy member | copy module | copy protection |
| copybook | copybroke | copying garbage collection |
| copyleft | copyright | copywronged |
| CORAL | CORAL 66 | CORBA |
| CORBIE | CORC | core |
| core cancer | core dump | core gateway |
| core leak | Core Protocol Stack | Core War |
| Corel Corporation | Corel VENTURA | corge |
| Cornell List Processor | Cornell Theory Center | Cornell University |
| Coroutine Pascal | Corporation for Open Systems | Corporation for Research and Educational Networkin |
| CORREGATE | Correlatives and Conversions | Cortex |
| CORTL | COS | COSE |
| COSINE | cosmic rays | COSS |
| cost control callback | Cost Driver Attribute | Cost/Schedule Control System Criteria |
| COTS | Cougar | cough and die |
| countable | countably many | counted |
| country code | coupling | Course Author Language |
| courseware | Coursewriter III | cowboy |
| COWSEL | CP | CP/M |
| CPAN | CParaOps5 | CPE |
| CPGA | CPI | CPL |
| CPLD | CPM | cpo |
| cpp | cppp | cproto |
| CPS | CPSR | CPU |
| CPU Info Center | CPU time | CPU Wars |
| CR | cr | crack root |
| cracker | cracking | crank |
| crapplet | CrApTeX | crash |
| crash and burn | crawler | crawling horror |
| Cray instability | Cray Research, Inc. | crayola |
| crayola books | crayon | CRC |
| creationism | creeping elegance | creeping featurism |
| creeping featuritis | CREN | CREW PRAM |
| crippleware | criptography | Crisis Software |
| CRISP | crisp | Crispy Critters |
| critical mass | critical section | CRL |
| CRLF | CRM | crock |
| cron | cross software | cross-assembler |
| cross-compiler | cross-platform | cross-post |
| CROSSTABS | crosstalk | CROW PRAM |
| CRT | crudware | crumb |
| crunch | cruncha cruncha cruncha | crunchy |
| cryppie | crypt | Crypt Breakers Workbench |
| cryptanalysis | cryptography | cryptology |
| Crystal | CS-4 | CS-Prolog |
| CS/PCode | CS/QCode | CSCI |
| CSCW | CSG | CSG-tree |
| csh | CSID | CSK Corporation |
| CSK Software | CSL | CSLIP |
| CSM | CSMA/CD | CSMP |
| CSNET | CSO | CSP |
| CSP-S | CSP/80 | CSP/k |
| CSPS | CSR | CSS |
| CSS/II | CSSA | CSSL |
| CSTools | CSU | CSU/DSU |
| CSV | CT | CTC |
| CTCP | CTI | CTL |
| CTOS | ctrl | CTS |
| CTSS | CTY | CU |
| cu | CU-SeeMe | CUA |
| Cube | cube | cubing |
| CUCH | Cuckoo’s Egg | CUL |
| Culler-Fried System | CUPID | CUPL |
| curly bracket | current | curried function |
| currying | curseperl | curses |
| cursor | cursor dipped in X | CUSI |
| cuspy | Customer Information Control System | Customer Information Systems |
| Customer Interaction Software | Customer Relationship Management | CUT |
| cut a tape | cut and paste | cut-through switching |
| cutover | cv | CVS |
| CW | CWeb | CWI |
| CWIC | CWIS | cx |
| cxref | cy | Cy486SLC |
| cyber | cyber-squatting | cyberbunny |
| cyberchondriac | cybercrud | CyberGlove |
| cybernetics | cyberpunk | cyberrhea |
| cybersex | cyberspace | cyberspastic |
| CyberWand | CyberZine | CYBIL |
| Cyc | CYCL | cycle |
| cycle crunch | cycle drought | cycle of reincarnation |
| cycle server | cyclebabble | cyclic redundancy check |
| cyclic redundancy code | Cyclo | cyclomatic complexity |
| Cygnus Tcl Tools | cylinder | CypherText |
| Cyrix | Cyrix 6×86 | cz |