. "Pregn., that faculty of the mind which forms the basis of computation and calculation , and hence of mental action in general, i. e. judgment , understanding , reason ; so, nulla ratio est, with an objectclause ; cf. with dat." . "Pregn., that faculty of the mind which forms the basis of computation and calculation , and hence of mental action in general, i. e. judgment , understanding , reason ; so, nulla ratio est, with an objectclause ; cf. with dat." . .