2 syllables: fis, sion. Stress on fis.
/ˈfɪʒən/
Say it backFission is the process of splitting something—often a cell or nucleus—into two or more parts. In science, it refers to nuclear fission, where a heavy nucleus splits, releasing energy. The term can also describe biological or other forms of division, but its core idea is a division into smaller portions.
- Misplacing stress or over-pronouncing the second syllable; correct by enforcing primary stress on the first syllable and reducing the second to /ən/. - Sliding from /f/ into an elongated /ɪ/; practice with a slower tempo and a crisp /ɪ/ before the /ʃ/. - Substituting /ʃ/ with /s/ or /tʃ/; ensure tongue blade near the palate creates the palato-alveolar friction /ʃ/.
"Nuclear fission releases energy that can be harnessed for power."
"Cell fission is a common type of asexual reproduction in some organisms."
"The fission of the atoms caused a measurable increase in radiation."
You say /ˈfɪʃən/. Stress on the first syllable: FIS- + -on. The first vowel is a short i as in “sit,” the second syllable has a schwa or reduced vowel: /ən/. Mouth position: lips neutral, tongue high-mid to mid, with a /ʃ/ sound made by the blade of the tongue near the hard palate. Audio reference: listen for the strong first beat and soft, unstressed second syllable.
Common errors include saying /ˈfɪsiːn/ with a long i in the second syllable (two clear vowels) or misplacing the /ʃ/ as /s/ or /tʃ/. Correct by ensuring the second syllable reduces to /ən/ and keeping the /ʃ/ sound as a single, unvoiced palato-alveolar fricative. Practice with minimal pairs: FIS-tion vs FIS-tion (accent), and keep the mouth rounded for /ʃ/ without adding extra vowel.
In US/UK/AU, the initial /f/ and /ʃ/ are consistent. The main difference is vowel quality of the first syllable: US often uses a slightly higher, tenser /ɪ/; UK and AU may present a slightly lax /ɪ/. The second syllable remains a reduced /ən/ in all, but Australians may have a more centralized schwa. Overall rhoticity is not a factor here since the word ends with /ən/.
Two main challenges: the mid-central schwa in the second syllable and the /ʃ/ cluster immediately after the first vowel. Some speakers lengthen the first vowel or add an extra vowel before /ʃ/. Maintain a crisp /ʃ/ and reduce the second syllable to /ən/ quickly. Practicing with a slow, deliberate pace helps the mouth settle into the correct mid-central vowel and the palato-alveolar fricative.
A distinctive concern is preserving the /ɪ/ quality in the first syllable while not over-pronouncing the second syllable. Some learners de-emphasize the /ʃ/ and make it /s/. Focus on the sequence: /f/ + /ɪ/ + /ʃ/ + /ən/. Visualize the tongue creating a brief expansion before the palato-alveolar fricative, then immediately relaxing into a weak, unstressed second syllable.
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- US: use a slightly tenser /ɪ/ and maintain a clear, non-rhotic vowel, with a strong /ʃ/; UK: may have a lighter /ɪ/ and a more clipped onset; AU: roll into a slightly flatter /ɪ/ with a relaxed /ən/, keeping a steady rhythm. IPA references: /ˈfɪʃən/ across regions; practice by listening to native speakers and matching rhythm. - Pay attention to vowel length: not prolonged. - Ensure the /ʃ/ remains continuous and unvoiced.
Fission comes from the Latin verb fissus, meaning “split, separated,” from the past participle of figere, to fix or fasten, and the Latin prefix dis- meaning apart. The form fission entered English via scientific Latin in the 19th century as a technical term in biology and physics. Its early use centered on the idea of division or cleavage, later narrowing to the splitting of a heavy atomic nucleus in nuclear physics after the advent of radioactivity and the development of nuclear weapons. The term parallels other -sion nouns such as division and precision, reflecting a common Latin-derived pattern for nouns describing processes or results. While “fission” originally could mean any act of splitting, in modern usage it almost exclusively refers to controlled or observed splitting in scientific contexts, particularly in molecular biology and nuclear science. First known uses in scientific literature appear in the 1830s for general splitting, but the nuclear sense became prominent in the mid-20th century during the expansion of nuclear energy research. In contemporary science writing, fission denotes a critical reaction in which an atomic nucleus splits into lighter nuclei, releasing neutrons and energy, with implications for both power generation and weapons development.
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💡 These words have similar meanings to "fission" and can often be used interchangeably.
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Words that rhyme with "fission"
-ion sounds
Practice with these rhyming pairs to improve your pronunciation consistency:
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