- deficiency relation
- deficiency space
- deficiency subspace
- deficiency-vertigo
- deficient
- deficient cold of bladder
- deficient graph
- deficient number
- deficient value
- deficit
- deficit angle
- deficit irrigation experiment
- defilade
- defiled document
- defiled document examination
- defiled mental consciousness (mano-vijñāna)
- definability
- definability theorem
- definable
- definable class
- definable predicate
- definable set
- defined
- defined benefit
- defined benefit plans