1 [U] [sing] the process or the result of joining different things together to form one （不同事物的）融合: the fusion of two political systems 两种不同政治制度的融合

2 (also ˌnuclear ˈfusion) [U] (in physics 物理学) the action or process of combining the central parts(nuclei)of atoms to form a heavier central part(nucleus), with energy being created 核聚变，核融合（原子核聚变成一种更重的核，同时释放能量） ☞Compare fission. 与fission比较。