digi - doub
- directional divergence parameter
- directional doublet
- directional flight path control
- directional handling qualities
- directional instability
- directional looseness
- directional mode
- directional retrimming
- directional simulation
- directional stability
- directional stability derivative
- directional stability fix
- directional stability parameter
- directional stiffness
- directional strength
- directional variable
- directionality
- directionally solidified alloy
- directionally solidified blade
- directionally solidified material
- directionally stabilizing
- directivity
- director
- Dirichlet condition
- Dirichlet form
- dirty stall
- disbond
- disc
- discharge
- discontinuity
- discontinuity surface
- discontinuous control
- discontinuous fibers
- discontinuous grid
- discontinuous leading edge
- discrepancy
- discrete
- discrete control
- discrete coordinates
- discrete disturbance
