- ".cda", a Filename Extension for a CD Audio Track Shortcut
- Canadian Dental Association , an association of dentists in Canada
- Canadian Dinghy Association
- Capital Development Authority , Islamabad, Pakistan.
- Centre For Defence Analysis , part of the British Defence Evaluation and Research Agency (DERA)
- Chaos Data Analyzer , a research and teaching tool containing 14 tests for detecting hidden determinism in a seemingly random time series
- '' Christen-Democratisch Appèl '', a political party of the Netherlands
- Clean Dry Air, air that has been filtered and dehumidified to remove particulates and moisture so that it can be safely used in pneumatic devices or systems
- Clinical Document Architecture , an HL7 authored health care documentation standard
- Coeur D'Alene , a city in North Idaho
- College Democrats Of America , the national organization that oversees the direction and day-to-day management of 1300 College Democrats chapters around the country
- Communications Decency Act , a US law which says that "No provider or user of an interactive computer service shall be treated as the publisher or speaker of any information provided by another information content provider" and had provisions relating to letting children access pornography which were found to be unconstitutional
- Confidential Disclosure Agreement, another name for a Non-disclosure Agreement (NDA)
- Congenital Developmental Abnormality/Abnormalities
- Conservative Democratic Alliance , a United Kingdom Pressure Group
- Co-operative Development Agency, advice agencies for people who wanted to start co-operatives set up as part of the community economic development effort in many British localities in the 1980s
- Critical Discourse Analysis , a branch of Sociolinguistics
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