1. (mathematics) unaffected by a designated operation or transformation
   "The area of a triangle is invariant under translation"
    
2. Unvarying in nature
   "The invariant rhythm of the waves";
   - changeless, constant, unvarying

1. (mathematics) a feature (quantity, property or function) that remains unchanged when a particular transformation is applied to it
   "The determinant of a matrix is an invariant under similarity transformations"

Derived forms: invariants

See also: invariable

Type of: characteristic, feature

Encyclopedia: Invariant