- cochleoid
- Cochrane-Orcutt's method of estimation
- cocircuit
- cocircuit basis
- cocircuit matrix
- cocommutativity of coalgebra
- cocomplex
- cocomplex category
- cocomplex translation
- cocycle
- cocycle space
- Codazzi equations
- code
- code division multiple access
- code of a design
- code of a plane graph
- codes with finite deciphering delay
- codifferential
- codifferential operator
- codimension
- codimension
- codimension
- codimension of linear subspace
- coding efficiency
- coding mapping