a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it
source: WordNet 3.0
An invariable quantity; specifically, a function of the coefficients of one or more forms, which remains unaltered, when these undergo suitable linear transformations.
source: Webster 1913
adjective satellite
unaffected by a designated operation or transformation
source: WordNet 3.0
unvarying in nature
Maintained a constant temperature. Principles of unvarying validity.
