1. of, relating to, or produced by fission (the splitting of an atomic nucleus or cell)
Usage: technical; scientific

Examples

• The fissional energy released by uranium-235 powers nuclear reactors.
• Fissional reactions in the sun's core produce the energy that sustains life on Earth.
• Scientists study fissional processes to understand nuclear physics.
• The fissional products of nuclear decay can be radioactive and dangerous.