definition of
invariant

[1] #1 invariant s. unaffected by a designated operation or transformation. wn

[2] #2 invariant n. a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it. wn

[3] #3 invariant s. [changeless, constant, unvarying] unvarying in nature; "maintained a constant temperature"; "principles of unvarying validity". wn