ee/i/
Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.
How to pronounce ecosystem in American English
EE·koh·sihs·tuhm
Start here
Americans pronounce ecosystem as EE-koh-sihs-tuhm (/ˈikoʊˌsɪstəm/). Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "Sharks are the apex predators of the ocean ecosystem" or "The coral reef is a diverse ecosystem teeming with life" — more examples below.
Now you try.
Record yourself saying "ecosystem" and play it back. The mic stays on your device — nothing's uploaded.
Sound by sound
Every sound in "ecosystem".
4 syllables, 9 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
k/k/
Raise the back of your tongue to touch the soft palate (velum). Stop the air, then release.
oh/oʊ/
Start with your mouth slightly open, then close your jaw slightly as your lips round. Shift your tongue back slightly, then stretch the back up.
s/s/
Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.
ih/ɪ/
Drop your jaw slightly with relaxed lips. Touch the tongue tip behind the bottom front teeth and arch the top-front toward the roof.
s/s/
Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.
t/t/
Touch the tip or front edge of your tongue to the roof of your mouth just behind your teeth. Keep your jaw relaxed. Stop the air, then release with a puff.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
m/m/
SyllabicThe schwa before M disappears — M becomes the vowel of the syllable. Go straight from the previous consonant to M.
In real conversation
Hear "ecosystem" in the wild.
Click any sentence to see the full breakdown — every link, every reduction, every flap-T.
"Conservation efforts have helped restore the local ecosystem successfully."
kahn·ser·VAY·shuhn EH·ferts huhv HEHLPT ruh·STOR dhuh LOH·kuhl EE·koh·sihs·tuhm suhk·SEHS·fuh·lee
"Insects play a vital role in the ecosystem as pollinators."
IHN·sehkts PLAY uh VAHY·duhl ROHL ihn dhee EE·koh·sihs·tuhm uhz PAH·luh·nay·derz
"Sharks are the apex predators of the ocean ecosystem."
SHARKS ar dhee AY·pehks PREH·duh·terz uhv dhee OH·shuhn EE·koh·sihs·tuhm
"The coral reef is a diverse ecosystem teeming with life."
dhuh KOR·uhl REEF ihz uh duh·VURS EE·koh·sihs·tuhm TEE·muhng wihdh LAHYF
"The ecosystem depends on a balance of predators and prey."
dhee EE·koh·sihs·tuhm duh·PEHNDZ ahn uh BA·luhns uhv PREH·duh·terz and PRAY
"The ecosystem relies on a delicate balance between predators and prey."
dhee EE·koh·sihs·tuhm ruh·LAHYZ ahn uh DEH·luh·kuht BA·luhns buh·TWEEN PREH·duh·terz and PRAY
Find another
Looking for a different word or sentence?
Search the entire library
/
Press / anywhere to focus the search box.
Watch out
Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
01
Inserting a vowel before the syllabic consonant.
In "ecosystem", the short unstressed vowel before "m" disappears — the schwa is absorbed and the "m" becomes the syllable nucleus on its own. Schwa is absorbed — consonant becomes the syllable nucleus.
ecosystem→EE·koh·SIHS·tuhm
02
Stressing the wrong syllable.
Stress falls on the first syllable, not the others. Stretch EE — keep everything else short and quick.
ee·KOH·SIHS·TUHM→EE·koh·SIHS·tuhm
03
Pronouncing the unstressed syllable too fully.
Don't pronounce the third syllable too fully. The unstressed syllable reduces to a schwa — the lazy "uh" sound — in casual speech.
EE·koh·sihs·TUHM→EE·koh·SIHS·tuhm
Questions
Questions people ask about this.
How is "ecosystem" stressed in American English?
Stress falls on the first syllable — say "EE" with a longer, fuller vowel and keep every other syllable short and quick. The respell "EE-koh-sihs-tuhm" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
Why does the fourth syllable in "ecosystem" reduce to "uh"?
Unstressed syllables in American English collapse toward a schwa — a lazy, neutral "uh" sound. The full vowel is what textbooks teach, but in actual American speech every unstressed vowel reduces. The respell "EE-koh-sihs-tuhm" shows the reduced form so you can hear the casual rhythm directly.
Is the American pronunciation of "ecosystem" different from British English?
American English uses different vowel shapes, a relaxed retroflex R, and connected-speech tricks like flap-T and glottal-stop T that British Received Pronunciation generally avoids. The respell "EE-koh-sihs-tuhm" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
Stop reading about "ecosystem". Start saying it.
SayWaader is the AI pronunciation coach for American English. Practice 5 minutes a day. Get a 5-axes accent assessment. Sound like you live here.