What does IDEF mean?

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What does idef stand for

AcronymDefinition
IDEFICAM Definition Methodology
IDEFIntegrated Definition
IDEFIntegrated Definition Language
IDEFIntegrated Definition Modeling Methodology
IDEFIntegrated Definition for Data Modeling
IDEFIntegration Definition Function
IDEFInternational Defence Industry Fair
IDEFInternational Digital Entertainment Festival
IDEFIntrusion Detection Exchange Format