Find Antonyms

fission Antonyms

Opposite of fission

Because the opposite of fission shifts with each meaning, the 10 antonyms and opposite words below are separated across 4 exact definitions and ranked by contrast strength.
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• noun (Context 1)

A nuclear reaction or radioactive decay process in which the nucleus of a heavy atom splits into two or more lighter nuclei, releasing a large amount of energy.

Usage Example

"Commercial nuclear power plants generate electricity through the controlled fusion of uranium atoms."

Strongest
fusion

• noun (Context 2)

A form of asexual reproduction in which a single cell or organism divides into two or more independent parts, each regenerating into a complete organism.

Usage Example

"Most bacteria reproduce rapidly through binary syngamy under favorable environmental conditions."

Strong
syngamy
conjugation

• noun (Context 3)

The act or process of splitting or breaking up into separate parts or factions.

Usage Example

"Ideological disagreements eventually led to the unification of the coalition into several smaller parties."

Strongest
unification
merger
coalescence
Strong
coalition

• verb (Context 4)

To split or cause to split into two or more parts (especially of an atomic nucleus or a biological cell).

Usage Example

"When a slow neutron strikes a uranium-235 nucleus, the atom fissions and releases additional neutrons."

Strongest
fuse
merge
Strong
coalesce

Similar words to fission

Words similar to fission shift depending on context. Common synonyms include:

nuclear fission
split
divide
schizogenesis
division
scission
cleave
cleavage
See all synonyms of fission

• Nearby Words

fishless
fishnet
fishy
fission
fissure
fist
fistfight

Cite this Entry

Wordmom. (2026). Antonyms for Fission. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/fission
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