অর্থ : A feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it.
অর্থ : Unaffected by a designated operation or transformation.
অর্থ : Unvarying in nature.
							উদাহরণ : 
							Maintained a constant temperature.
							Principles of unvarying validity.
							
সমার্থক : changeless, constant, unvarying