- completely regular space
- completely semiprime ideal
- completely semiprime ideal of a semigroup
- completely set-valued mapping
- completely simple semigroup
- completely symmetric multilinear mapping
- completely symmetric tensor space
- completely symmetrizer
- completely uniform space
- completely unstable dynamical systems
- complete market
- complete measure
- complete measure
- complete measure space
- complete metric space
- complete metric space
- completeness
- completeness of a system of predicate calculus
- completeness of axioms
- completeness of axiom system
- completeness of locus
- completeness of propositional calculus
- completeness of real number system
- completeness theorem
- complete n-gon