How to pronounce “decomposition”
Decomposition is pronounced /ˌdiːkəmpoʊˈzɪʃən/. It has 5 syllables, and the beat falls on the fourth one — zɪ. Below: the syllable split, native audio in both accents, the mistake people actually make with this word, and every individual sound in it explained.
Syllables and stress
Split it into 5 beats. The highlighted syllable is the strong one: say it louder, longer and a touch higher in pitch, and let the others fall away. English is a stress-timed language, so getting zɪ in the right place matters more to a listener than getting every vowel perfect.
Stress pattern ōooOo — capital letters mark the stressed beats.
The common mispronunciation of “decomposition”
✗ Often said: /ˈdekɑːmpɑːsɪtɪɑːn/ — the spelling, read straight off the page.
✓ Actually: /ˌdiːkəmpoʊˈzɪʃən/
Why the two come apart: the stress lands on the fourth syllable (“zɪ”), not on the first one — putting the beat at the front is the mistake almost everyone makes; also, the unstressed vowels flatten all the way down to /ə/ — English swallows them, so they never sound the way they are written; also, at least one vowel does not say what its spelling suggests — English vowel letters are not reliable here; also, a consonant letter takes an unexpected sound value here, so reading it "as written" comes out wrong.
This is why reading English aloud from spelling alone goes wrong so often: the letters of “decomposition” are not a reliable map of its sounds. The IPA is — each symbol stands for exactly one sound, every time.
“decomposition” sound by sound
“decomposition” is built out of 12 sounds. Say each one on its own first, slowly, then run them together at speed. Every sound links to a full guide with mouth position, the mistake learners make with it, and other words that use it.
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dSame tongue position as /t/ — tip on the ridge behind the upper teeth — but voice the sound and release it without aspiration.
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iːSpread the lips into a smile, push the front of the tongue high and forward, and hold the sound tense and long.
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kRaise the back of the tongue to touch the soft palate, seal the air, then release it with a puff.
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əDo almost nothing: leave the tongue in its neutral resting position, mouth slightly open, and make the shortest, weakest possible vowel.
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mClose the lips, lower the soft palate and let the voiced air come out through the nose.
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pPress both lips together, build up air behind them, then release with a puff of air (aspiration) when the sound starts a stressed syllable.
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oʊStart with mid-back, lightly rounded lips and glide toward /ʊ/, tightening the rounding as you finish.
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zExactly the /s/ tongue position with voicing added, so the airflow buzzes.
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ɪRelax the tongue slightly lower and further back than for /iː/, keep the lips neutral, and make it short and lax.
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ʃPull the tongue slightly back from the /s/ position, spread the blade wide behind the ridge, round the lips a little, and push air through with no voice.
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əDo almost nothing: leave the tongue in its neutral resting position, mouth slightly open, and make the shortest, weakest possible vowel.
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nTouch the tongue tip to the ridge behind the upper teeth, lower the soft palate, and voice the air out through the nose.
Words that rhyme with “decomposition”
Same ending sound from the stressed vowel on — a good way to hear whether you have the vowel right:
Questions people ask about “decomposition”
- How do you pronounce “decomposition”?
- “decomposition” is pronounced /ˌdiːkəmpoʊˈzɪʃən/, with the stress on the fourth syllable (zɪ). Press the US or UK button above to hear it spoken.
- How many syllables are in “decomposition”?
- “decomposition” has 5 syllables: diː · kəm · poʊ · zɪ · ʃən. The stress pattern is ōooOo.
- What is the common mispronunciation of “decomposition”?
- People read it off the spelling as /ˈdekɑːmpɑːsɪtɪɑːn/, but it is actually /ˌdiːkəmpoʊˈzɪʃən/, because the stress lands on the fourth syllable (“zɪ”), not on the first one — putting the beat at the front is the mistake almost everyone makes.
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