Medical Definition of fusion
1a: the act or process of liquefying or rendering plastic by heatb: the liquid or plastic state induced by heat
2: a union by or as if by melting together: asa: a merging of diverse elements into a unified whole; specifically : the blending of retinal images in binocular visionb: a combination of ingredients achieved by heating and mixing togetherd: the surgical immobilization of a joint—see spinal fusion
3: the union of atomic nuclei to form heavier nuclei resulting in the release of enormous quantities of energy when certain light elements unite—called also
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