I read somewhere that elasticity is the measure of the tendency of an object to resist deformation (similar to how inertia resists motion). I also read elsewhere that elasticity is the measure of how well an object returns to its shape/form after removing the applied force. Which definition is correct? Are they two sides of the same coin: An object with a high elasticity value would be tough to deform, but it would also be able to return to its original form/shape more or less accurately. An example or picture illustrating the concept would be preferable.