- definite sign
- definite subspace
- definition
- definitional domain
- definitional equivalence
- definitional identity
- definitionally equal
- definition by abstraction
- definition by cases
- definition by extension
- definition by induction
- definition by mathematical induction
- definition by recursion
- definition by transfinite induction
- definitizable operator
- definization method
- deflation
- deflation mapping
- deflation method
- deflection
- deflexion (= deflection)
- deformable
- deformable solid
- deformable space
- deformable surface