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IDF or idf may refer to:
- AIDC F-CK-1 Ching-kuo, Indigenous Defense Fighter, Taiwanese fighter aircraft
- Idiofa Airport, Idiofa, Democratic Republic of the Congo (IATA airport code)
- Intel Developer Forum
- Intermediate distribution frame, a cable rack for telecommunications wiring
- Intermediate Data Format, a file format for electronic design automation
- International Diabetes Federation, a worldwide alliance of diabetes associations
- Inverse Document Frequency, a factor in the tf–idf principle
- International DOI Foundation, the developer of the digital object identifier
- IDF1, a French family-oriented local television channel serving the Île-de-France
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