| Cascading Style Sheet |
| Counter-Strike: Source (gaming) |
| Counter-Strike:Source |
| Catholic Social Services (various locations) |
| Combat Service Support |
| Cross Site Scripting |
| Context-Sensitive Solutions |
| Central Security Service |
| College Scholarship Service (Princeton, NJ) |
| Content Scrambling System (DVD) |
| Customer Support Services |
| Cansei de Ser Sexy (Brazilian band) |
| Control Systems Society |
| California Superbike School |
| Customer Satisfaction Survey |
| Community Support Services |
| Customer Service & Support |
| Code de la Scurit Sociale (France) |
| Closed Source Software |
| Customer Self Service |
| Customer Service Specialist |
| Customer Service Site |
| Churg-Strauss Syndrome |
| Center for Strategic Studies (Jordan) |
| Child Safety Seats |
| Catholic Secondary School (Canada) |
| Channel SubSystem |
| Community Service Society |
| Camille Saint-Saens (classical composer) |
| Customer Support System |
| Cyclic Steam Stimulation |
| Cross-Sectional Study |
| Commission on Secondary Schools |
| Content Service Switch(ing) |
| Customer Service System |
| Charter Sports Southeast |
| Computer Service Support |
| Computer Support Specialist |
| Classroom Support Services |
| Combat Support System |
| Contact Start Stop (Hard Disk Drive) |
| County Surveyors' Society (UK) |
| Credit Scoring System |
| Canadian Sleep Society |
| Computing and Software Systems (degree program) |
| Computer-Science School |
| Centrally Sponsored Schemes (India) |
| Colorado Springs School |
| Core System Software |
| Celtic Football Club (Scottish soccer club) |
| Communications Subsystem |
| Command Support System |
| Crisis Support Services (of Alameda County, California) |
| Chicken Salad Sandwich |
| Coastal Systems Station (now Naval Surface Warfare Center Panama City) |
| Central Support Services |
| Contact Start-Stop |
| comp.sys.sinclair (USENET newsgroup) |
| Centrale Sanitaire Suisse |
| Commonwealth Secondary School (Singapore) |
| Central Statistical Services (South Africa) |
| Confederate States Ship (Civil War naval vessel prefix) |
| Cisco Security Specialist |
| College Success Skills |
| Contractor Support Services |
| Corn Syrup Solids |
| Closed Side Setting (rock crushers) |
| Center for Seismic Studies |
| Calderbank-Shor-Steane (coding scheme) |
| Can't Shoot Straight (gaming clan) |
| Combat Support Squadron |
| Computer Subsystem |
| Corporate Security Solutions |
| Contract Support Services |
| Coarse Sun Sensor |
| Computer Systems Squadron |
| College of Social Studies (Wesleyan University) |
| Channel Stacking Switch |
| Clerical Support Staff |
| Controlled Slip Seconds |
| Chicago, South Shore, and South Bend Railroad |
| Commander Submarine Squadron |
| Certified Security Solutions, Inc. (Kirkland, WA) |
| Customer Switching System |
| Church and State Separation (political/religious forums) |
| Certified Security Supervisor (International Foundation for Protection Officers) |
| Certificate of Special Studies (Harvard Extension School in administration and management) |
| Containment Spray System |
| Corn Stunt Spiroplasma |
| Customer Service Series |
| Cervical Spinal Stenosis |
| Certified Senior Specialist |
| Constant Surveillance Service |
| Communication Systems Security |
| Client Support Service |
| Chemical Sciences Scotland (UK) |
| Christian Stewardship Services (Markham, ON, Canada) |
| Comcast Sports Southeast/Charter Sports Southeast |
| Clock Security System (microcontroller, semiconductor) |
| Communication Support Systems |
| Control Stick Steering (NASA) |
| Client Services Supervisor |
| Concentration in Serum |
| Content Storage System |
| Clothing Sales Store |
| Caustic Soda Solution (chemistry) |
| Canadian Secret Service |
| Central Superior Services of Pakistan |
| Communications Security System |
| Central Structure Store (computer science) |
| Calgary Science School |
| Cyberspace Safety and Security (International Workshop) |
| Cell Site Switch |
| Cognitive Systems Society (University of British Columbia, Vancouver, Canada) |
| Characteristic Structures |
| Connection-Successful Signal |
| Coordinator Surface Search |
| Command Session Start (ITU-T) |
| COMSEC Subordinate Switch |
| Contingency Support Staff |
| Commanders Support Staff |
| Colorado Spider Survey (Denver Museum of Nature and Science) |
| Communications Standards Summary |
| Compassionate Service Society (California) |
| Composite Source Signal (ITU-T) |
| Common Support System |
| Checkpoint Security Supervisor |
| Commercial Satellite Survivability |
| Computer Support Section |
| Communications System Segment |
| Continuous Signature Service (courier) |
| Coded Switch System |
| Convolutional Spectral Shaping |
| Collaborative Software System |
| Copy Scramble System |
| Core Segment Simulator (NASA) |
| Core Security Services |
| Certified Semen Services, Inc. (National Association of Animal Breeders) |
| Coded Switch Set |
| Central State School (Gladstone, QLD, Australia) |
| Combined Suspension System (Renault, France) |
| Computer Search System |
| Cement Solidification System |
| Chiswick Community School (UK) |
| Stigmatine Fathers and Brothers (religious order) |
| Contaminated Soil Storage |
| Calpain Small Subunit (gene) |
| Conspicuous Service Star (New York state) |
| Consomic Strain |
| Communications Switching Systems |
| Content Security Suite |
| Contaminated Soil Site |
| Combat Systems Simulation |
| Cell Site Selection |
| Counter Sunk Screw |
| Concurrent Servicing Supervisor |
| Combat Supply System |
| Common Semantics Syntax |
| Colorado Silica Sand |
| Cassini Stratospheric Sounder |
| Consolidated Support System |
| Control & Safety System |
| Command Support Services (group command staffing issues) |
| Computer Services Squadron |
| Crew Support Station |
| Control & Status System (NASA) |
| Coolangatta Special School (Gold Coast, Australia) |
| Center Support Structure |
| Certified Specialist of Spirits (Society of Wine Educators certification) |
| Consolidated Supply Support |
| Client Session Setup |
| Crycooler Subsystem (HIRDLS) |
| Coolangatta State School (Gold Coast, Australia) |
| Currumbin State School (Gold Coast, Australia) |
| Contemporary Standard Slovene |
| Criticality Safety Specification |
| Centralized Supply Support |
| Cellular System Simulator |
| Combined Service Support |
| Cryptography Support Services |
| Client Safety Services |
| Communication Support Squadron (US Air Force AFSPC) |
| Coomera State School (Gold Coast, Australia) |
| Core Software Server |
| Chow Sang Sang Jewellery (Hong Kong) |
| Centralized Service Server |
| Continuity of Service Set |
| Coombabah State School (Gold Coast, Australia) |
| Communications Security Subordinate Switch |
| Commanders Senior Staff |
| Clinton State School (QLD, Australia) |
| Continuous Surveillance Service |
| Common Services Subsystem |
| Control Solenoid Status |
| Corps Surgeon Section |
| Criticality Safety Specialist |
| Communications Support Shelter |
| Communications Selector Switch |
| Common Systems Software (Sprint & ITI) |
| Conventional Serial Search |
| Caningeraba State School (Gold Coast, Australia) |
| Cable-Stayed Structures |
| Canungra State School (Gold Coast, Australia) |
| Collaboration Support Service |
| Communications Security Symposium |
| Common Sense Science (Roswell, GA) |
| Center for Sustainable Systems (University of Michigan) |
| Classic System Solutions (San Jose, CA) |
| Corkscrew Swamp Sanctuary (Naples, FL) |
| Citizens for Sensible Safeguards (coalition) |
| Combined Synopsis/Solicitation |
| Crop and Soil Science (various universities) |
| Clinical Study Summary (various organizations) |
| Class Software Solutions |
| Children's School of Science (Woods Hole, MA) |
| Commuter Student Services |
| Customer Support Solution (software) |
| Community Service Scholarship (various schools) |
| Comprehensive Student Support (various locations) |
| Computer Software Services (various locations) |
| Center for Space Sciences (University of Texas at Dallas) |
| Cost Sharing System |
| College of Saint Scholastica (Duluth, MN) |
| Counseling Support Services (various organizations) |
| Cascading Style Sheet (computing) |
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