Definition of fusion
1 : the act or process of liquefying or rendering plastic by heat
2 : a union by or as if by melting: such as
a : a merging of diverse, distinct, or separate elements into a unified whole Opera is a fusion of several arts.
b : a political partnership : coalition a fusion of Democrats and independent Republicans — New York Times
c : popular music combining different styles (such as jazz and rock)
d : food prepared using techniques and ingredients of two or more ethnic or regional cuisines a restaurant that specializes in Indian-Chinese fusion
— called also fusion cuisine
3 : the union of atomic nuclei to form heavier nuclei resulting in the release of enormous quantities of energy when certain light elements unite nuclear fusion
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