Cambridge Antiquarian Society
• (Guyana ) Carib Advertising Services
• Chem. cationic and ampholytic surfactants
• Centre for Administrative Studies
• CERN Accelerator School
• (USA ) Certificate of Advanced Studies
• Chemical Abstracts Service
• Chief of Air Staff
• Children' Aid Society
• close air support
• Aeronautics collision avoidance system
• controlled airspace
• Med. coronary arterial stenosis
• Physics criticality alarm system
• Fellow of the Connecticut Academy of Arts and Sciences (Latin Connecticutensis Academiae Socius)