Might mean (unverified): Not involving nuclear splitting process.
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We found one dictionary that defines the word nonfission:

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  1. nonfission: Wiktionary

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Definitions from Wiktionary (nonfission)

▸ adjective:  Not of or pertaining to fission.

Similar:
nonfusion, nonfissionable, unfissionable, nonfallout, nonfertilizer, unfissioned, nonfracture, nonfermentation, fissionless, nonmutation, more...

Opposite:
fission, splitting, division, separation, cleavage

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Similar:
nonfusion, nonfissionable, unfissionable, nonfallout, nonfertilizer, unfissioned, nonfracture, nonfermentation, fissionless, nonmutation, more...

Opposite:
fission, splitting, division, separation, cleavage



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