- directed xy walk
- directed xy-walk
- direct effect
- direct effects hypothesis
- direct election
- direct electric heating method
- direct energy conversion operation
- direct ethanol fuel cell
- direct evaluation of external corrosion of oil and gas pipelines
- direct evaluation of internal corrosion of oil and gas pipelines
- direct exchange interaction
- direct expansion method
- direct-expansion refrigeration
- direct expense coefficient
- direct extrusion
- direct factor
- direct feeding system of electric traction
- direct fermentation
- direct finance
- direct financial payment
- direct-fired agriculture and forestry biomass for cogeneration of heat and power
- direct fission yield
- direct flotation
- direct flow
- direct force/aerodynamic blended control