- free monoid
- free network adjustment
- free nonassociative algebra
- free normal extension
- free object
- free occurrence
- free product of Boolean algebras
- free product of groups
- free product of lattice-ordered groups
- free product of lattices
- free product of universal algebra
- free product with amalgmations
- free resolution
- free ring
- free ring over Ω
- free semigroup
- free station method
- free surface wave in liquid
- free term of partial differential equation
- free transversality condition
- free universal algebra
- free variable
- free vector
- free vibration
- free vibration period of structure