tempering >> ˈtɛmpə
Definition: [verb] improve the hardness and elasticity of (steel or other metal) by reheating and then cooling it.
Example: the way a smith would temper a sword
Definition: [verb] act as a neutralizing or counterbalancing force to (something).
Example: their idealism is tempered with realism
Definition: [verb] tune (a piano or other instrument) so as to adjust the note intervals correctly.