# CDI

CDI, CDi, CD-i, or .cdi may refer to:

## Businesses and organizations
### Government and political organizations

* Center for Defense Information, a Washington, D.C. think tank founded in 1972
* Center for Digital Inclusion, originally "Comitê para Democratização da Informática", a non-governmental organization in Brazil
* Centrist Democrat International, formerly the Christian Democrat International, a political international formed in 1961
* China Development Institute, a Shenzhen, China think tank founded in 1989
* Comisión Nacional para el Desarrollo de los Pueblos Indígenas, Mexico's National Commission for the Development of Indigenous Peoples
* California Department of Insurance, The State of California insurance regulation department

### Schools and colleges

* CDI College, a for-profit college in Canada
* Collège des Ingénieurs, educational institution in France, Germany and Italy
* Control Data Institute, an international technical vocational school created by the American Control Data Corporation

### Other businesses

* Camperdown Dairy International, an Australian infant formula company
* CDI Corporation, an engineering services and employment agency in Philadelphia, PA
* Cellular Dynamics International, an American research support company
* Churchill Downs Incorporated, parent company of Churchill Downs
* Controlled Demolition, Inc., a Phoenix, Maryland firm that specializes in controlled demolition
* Chungdahm Institute, a company in Korea that specializes in teaching English

## Economics

* Category Development Index, measures the sales strength of a particular category of product, within a specific market
* Contrat à durée indéterminée, French for open-ended contract, the usual form of employment contract in France
* Child Development Index, a measure of global child poverty
* CREST Depositary Interest, in investing, a form of depositary receipt in the UK

## Science and technology
### In chemistry, biology and medicine

* Carbonyldiimidazole, an activating agent used for example for peptide coupling
* Central diabetes insipidus, an endocrine disorder
* Clinical documentation improvement, a process of improving healthcare records
* Clostridioides difficile infection, an intestinal disease also known as Clostridium difficile infection
* Combined drug intoxication, also known as Multiple Drug Intake (MDI)
* Contact-dependent growth inhibition, a type of toxin delivery between bacteria which requires direct contact
* Cyclin-dependent kinase inhibitor protein, a protein which inhibits cyclin-dependent kinase

### Computing

* Contexts and Dependency Injection, a Java standard for the inversion of control design pattern
* CD-i, a CD-derived multimedia format, including its players made by Philips

### Imaging techniques

* Coherent diffraction imaging, a lensless nanoscale imaging technique
* Current density imaging, an extension of magnetic resonance imaging (MRI)
* Color doppler imaging, a type of Doppler ultrasonography

### In transportation

* Capacitor discharge ignition or thyristor ignition, a type of electronic ignition system
* Common rail diesel injection, a modern method of fuel injection in diesel engines
* Course deviation indicator, an aircraft navigation instrument

### Other uses in science and technology

* Capacitive deionization, a water desalination technology based on the use of electrical field effects
* Common direct injection, a synonym of common rail; a type of fuel injection
* Customer data integration, a discipline concerned with representation of data in enterprise systems
* Cyrel Digital Imager, a direct laser-engraving flexography plate printing device
* .cdi filename extension, for DiscJuggler disk images, developed by Padus
* „ C$_{D, i}${\textstyle C_{D, i}}”, the lift-induced drag coefficient

## Other uses

* Côte d'Ivoire, a country in West Africa once known as Ivory Coast
* Chief of Defence Intelligence, head of the UK Defence Intelligence Staff
* Ciudad de las Ideas (conference), a conference at Puebla, Mexico
* Custodial Detention Index, a list of U.S. residents compiled by FBI during 1939–1941, later used for Japanese-American internment
* Chak De! India, a 2007 Bollywood sports film about field hockey in India
* 401 in Roman numerals
* Certified Deaf Interpreter, a certificate offered by the Registry of Interpreters for the Deaf