Standard Lemma guide

fission

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
Real reading context

fission in complete knowledge articles