What does DEF stand for?

MLA style: "DEF." Acronym Finder . 2012. AcronymFinder.com 29 May. 2012 <a href="http://www.acronymfinder.com/Definitions-(File-Name-Extension)-(DEF).html">http://www.acronymfinder.com/Definitions-(File-Name-Extension)-(DEF).html
Chicago style: Acronym Finder . S.v. "DEF." Retrieved May 29 2012 from <a href="http://www.acronymfinder.com/Definitions-(File-Name-Extension)-(DEF).html">http://www.acronymfinder.com/Definitions-(File-Name-Extension)-(DEF).html
APA style: DEF. (n.d.) Acronym Finder. (2012). Retrieved May 29 2012 from <a href="http://www.acronymfinder.com/Definitions-(File-Name-Extension)-(DEF).html">http://www.acronymfinder.com/Definitions-(File-Name-Extension)-(DEF).html

Definitions (File Name Extension)

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Data Exchange Format Decayed, Extracted, and Filled Tooth Decision Education Foundation Defaults (File Name Extension) Defend(ed) Defense Enterprise Fund Defense(ive) Defensman/Defensmen (hockey) Definite Definition		Defrost Deftones (band) Delayed Ettringite Formation (concrete) Département de l'Emploi Francophone (French: Department of Employment Francophone; various locations) Dependents Function Deployment Expeditionary Force (US Army) Design Exchange Format (Cadence) Detection Efficiency Function (microscope) Détection Électronique Française (French: French Electronic Detection) Detector and Extractor of Fileprints