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FITDFoot in the Door
FITDFinite Integral Time Domain
FITDFind-in-the-Dark (automated lighting)
FITDFondo Interbancario de Tutela Dei Depositi (Italian: Interbank Deposit Fund Protection)
FITDFORSCOM Intelligence Training Detachment
FITDForce Integration Training Division
FITDFar Infrared Target Detector
FITDForget It, That'll Do (polite form)