Wiktionary
fissioning
n. The act of splitting into two separate parts vb. (present participle of fission English)
Usage examples of "fissioning".
A minute later the radon was in the constriction, and incredible things were happening: radon fusing to transuranian elements, then fissioning immediately.
Any Knyfh could mate with any other, their mergence of nucleus and electron orbit resulting in prompt fissioning into two new compromise entities.
Perhaps he was one of the males who dominated her own troop—the loose, fissioning band she thought of as a kind of composite father—but he was not, she quickly saw.