invariant adjective 3noun 2forms 3 adjective3 •Not varying; constant. •Unaffected by a specified operation, especially by a transformation. •Neither covariant nor contravariant. noun2 •An invariant quantity, function etc.In the present paper this criterion is reformulated in terms of pseudotensorial invariants of the form.. — 2015 •Ellipsis of class invariant. formsinvariants · more invariant · most invariant