Department for Transport Discrete Fourier Transform Distributed Function Terminal Density Functional Theory Demand Flow Technology Design for Test Diagnostic Function Test Digital Fourier Transform Discrete Fourier Transformation Design For Testability Draft Deaerating Feed Tank dementia of frontal type deployment for training Design For Testing Direct Facility Termination Distribution Functional Terminal Down Flow Tent Drive Fitness Test DART Fixed Terminal Deal Fell Through defibrillation defibrillation threshold defibrillation threshold testing defibrillation thresholds Defibrotide Degree of Fiber Treatment dementia frontal lobe type dementia of frontal lobe type density function theory