noun · verb · 7 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.
fĭsh'ən
fĭzh'ən
/ˈfɪʃən/
/ˈfɪʒən/
Southern-England:Recorded audio is listed in the source snapshot.
rhymes with -ɪʃən
rhymes with -ɪʒən
CMU ARPABET:F IH1 SH AH0 N
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
The process whereby one item splits to become two.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
nuclear fission: The process of splitting the nucleus of an atom into smaller particles.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
Qualifier: nuclear physics
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
3
noun
Meaning 3
The process by which a bacterium splits to form two daughter cells.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
Topics: biology, natural-sciences
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: fissiparism
Antonyms: none provided
4
verb
Meaning 4
To cause to undergo fission.
Definition source: English Wiktionary via Wiktextract
Usage: transitive
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
5
verb
Meaning 5
To undergo fission.
Definition source: English Wiktionary via Wiktextract
Usage: intransitive
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
6
noun
Meaning 6
a nuclear reaction in which a massive nucleus splits into smaller nuclei with the simultaneous release of energy
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: nuclear fission
Antonyms: none provided
Broader terms: nuclear reaction
7
noun
Meaning 7
reproduction of some unicellular organisms by division of the cell into two more or less equal parts
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
Broader terms: asexual reproduction, agamogenesis
Narrower terms: schizogony
History
Etymology
Borrowed from Latin fissiōnem, accusative singular of fissiō (“the act of breaking up”), from findō (“split, divide”).
Across languages
Translations
59 source translations are retained for this English entry.
Arabic:
اِنْقِسَام
(inqisām)
— process whereby one item splits to become two
Bulgarian:
разцепване
(razcepvane)
— process whereby one item splits to become two
Chinese Mandarin:
分裂
(fēnliè)
— process whereby one item splits to become two
Danish:
fission
— process whereby one item splits to become two
Danish:
deling
— process whereby one item splits to become two
Dutch:
splitsing
— process whereby one item splits to become two
Finnish:
fissio
— process whereby one item splits to become two
Finnish:
halkeaminen
— process whereby one item splits to become two
Finnish:
jakautuminen
— process whereby one item splits to become two
German:
Spaltung
— process whereby one item splits to become two
Greek:
διάσπαση
(diáspasi)
— process whereby one item splits to become two
Hindi:
विखण्डन
(vikhaṇḍan)
— process whereby one item splits to become two
Hindi:
विखंडन
(vikhaṇḍan)
— process whereby one item splits to become two
Hungarian:
hasadás
— process whereby one item splits to become two
Icelandic:
skipting
— process whereby one item splits to become two
Italian:
fissione
— process whereby one item splits to become two
Italian:
divisione
— process whereby one item splits to become two
Japanese:
分裂
(bunretsu)
— process whereby one item splits to become two
Korean:
분열
(bunyeol)
— process whereby one item splits to become two
Māori:
wehekarihi
— process whereby one item splits to become two
Mongolian:
хуваагдал
(xuvaagdal)
— process whereby one item splits to become two
Mongolian:
ᠬᠤᠪᠢᠶᠠᠭᠳᠠᠯ
(qubiyaɣdal)
— process whereby one item splits to become two
Norwegian:
spalting
— process whereby one item splits to become two
Norwegian Bokmål:
fisjon
— process whereby one item splits to become two
Norwegian Nynorsk:
fisjon
— process whereby one item splits to become two
Polish:
rozszczepienie
— process whereby one item splits to become two
Portuguese:
fissão
— process whereby one item splits to become two
Romanian:
fisiune
— process whereby one item splits to become two
Russian:
расщепле́ние
(rasščeplénije)
— process whereby one item splits to become two
Spanish:
fisión
— process whereby one item splits to become two
Ukrainian:
розще́плення
(rozščéplennja)
— process whereby one item splits to become two
Arabic:
انقسام
— process by which a bacterium splits into two
Bulgarian:
делене
(delene)
— process by which a bacterium splits into two
Chinese Mandarin:
分裂生殖
(fēnliè shēngzhí)
— process by which a bacterium splits into two
Czech:
štěpení
— process by which a bacterium splits into two
Danish:
celledeling
— process by which a bacterium splits into two
Finnish:
jakautuminen
— process by which a bacterium splits into two
French:
fission
— process by which a bacterium splits into two
French:
scissiparité
— process by which a bacterium splits into two
German:
Zellteilung
— process by which a bacterium splits into two
Greek:
πυρηνοτομία
(pyrinotomía)
— process by which a bacterium splits into two
Hindi:
द्विखण्डन
(dvikhaṇḍan)
— process by which a bacterium splits into two
Hungarian:
osztódás
— process by which a bacterium splits into two
Icelandic:
skipting
— process by which a bacterium splits into two
Polish:
podział
— process by which a bacterium splits into two
Portuguese:
fissão
— process by which a bacterium splits into two
Russian:
деле́ние
(delénije)
— process by which a bacterium splits into two
Spanish:
fisión
— process by which a bacterium splits into two
Finnish:
fissioida
— to cause to undergo fission
French:
fissionner
— to cause to undergo fission
German:
spalten
— to cause to undergo fission
Italian:
fissionare
— to cause to undergo fission
Polish:
rozszczepić
— to cause to undergo fission
Portuguese:
fissionar
— to cause to undergo fission
Russian:
расщеплять
(rasščepljatʹ)
— to cause to undergo fission
Spanish:
fisionar
— to cause to undergo fission
Finnish:
fissioitua
— to undergo fission
Polish:
rozszczepić się
— to undergo fission
Russian:
расщепляться
(rasščepljatʹsja)
— to undergo fission