[{"Bold_text": "noun", "List Items": ["the act of cleaving or splitting into parts.", "Also callednu·cle·ar fis·sion[noo, -klee-er , fish, -, uh, n, nyoo, -].Physics.the splitting of the nucleus of an atom into nuclei of lighter atoms, accompanied by the release of energy.Compare fusion(def4) fusion(def4).", "Biology.the division of an organism into new organisms as a process of reproduction."]}, {"Bold_text": "verb (used without object)", "List Items": ["Physics.to undergo fission."]}, {"Bold_text": "verb (used with object)", "List Items": ["Physics.to cause to undergo fission."]}]