How do you pronounce "fission"?

In American English: /ˈfɪʃən/ (FISH-uhn). In British English: /fˈɪʃən/ (F-ish). In Canadian English: /ˈfɪʃən/ (FISH-uhn). In Australian English: /fˈɪʃən/ (F-ish).

Is "fission" pronounced differently in American and British English?

Yes. In American English it's pronounced /ˈfɪʃən/ (FISH-uhn), while in British English it's /fˈɪʃən/ (F-ish).

How to Pronounce "fission"

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fission

disputed

/ˈfɪʃən/

FISH-uhn

Syllable Breakdown

fɪʃfis·ənsion

Source

80%confidence📘 CMU Pronouncing Dictionary v0.7b

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Last updated: 2026-02-14