invariant Meaning, Definition & Usage

noun a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it
adjective satellite unaffected by a designated operation or transformation
adjective satellite unvarying in nature
changeless; constant; unvarying.
- maintained a constant temperature
- principles of unvarying validity

(Math.) An invariable quantity; specifically, a function of the coefficients of one or more forms, which remains unaltered, when these undergo suitable linear transformations. J. J. Sylvester.