trans·mu·ta·tion 
(trăns′my-tāshən, trănz′-)
(trăns′my-tāshən, trănz′-)n.
1.
a. The act or an instance of transmuting; transformation.
b. The state of being transmuted.
2. Physics Transformation of one element into another by one or a series of nuclear reactions.
3. The supposed conversion of base metals into gold or silver in alchemy.
trans′mu·tation·al, trans·muta·tive (-mytə-tĭv) adj.