[mass noun]the action of dividing or splitting something into two or more parts 分裂,开裂;裂变 the party dissolved into fission and acrimony. 该政党已支离破碎,干戈鼎沸。 ■short for nuclear fission nuclear fission 的简称 ■(Biology)reproduction by means of a cell or organism dividing into two or more new cells or organisms (生)(细胞或有机体的)分裂;裂殖 bacteria divide by transverse binary fission. 细菌以横向二分裂的方式繁殖。
verb
[no obj.](chiefly of atoms) undergo fission (多指原子)裂变 these heavy nuclei can also fission. 这些重原子核也可裂变。
语源
early 17th cent.: from Latin fissio(n-), from findere 'to split'