ah/ɑ/
Relax your lips and drop your jaw significantly. The tongue tip lightly touches behind the bottom front teeth and the back part of the tongue presses down a little to create more dark space in the back of the mouth.
How to pronounce autonomous in American English
ah·TAH·nuh·muhs
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Americans pronounce autonomous as ah-TAH-nuh-muhs (/ɑˈtɑnəməs/). Stress falls on the second syllable — keep everything else short and quick. You'll hear it in sentences like "Autonomous vehicles are being tested in several major cities".
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Sound by sound
Every sound in "autonomous".
4 syllables, 8 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
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.
ah/ɑ/
Relax your lips and drop your jaw significantly. The tongue tip lightly touches behind the bottom front teeth and the back part of the tongue presses down a little to create more dark space in the back of the mouth.
n/n/
Touch the tip or front edge of your tongue to the roof of your mouth behind your teeth. Air flows through your nose.
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.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
s/s/
Place your tongue tip near the roof of your mouth behind your top teeth. Push air through the narrow gap. No voicing.
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Watch out
Common pronunciation mistakes in American English.
The textbook way isn't wrong — it's just not how anyone actually says it.
01
Stressing the wrong syllable.
Stress falls on the second syllable, not the others. Stretch TAH — keep everything else short and quick.
AH·tah·NUH·MUHS→ah·TAH·nuh·muhs
02
Pronouncing the unstressed syllable too fully.
Don't pronounce the second syllable too fully. The unstressed syllable reduces to a schwa — the lazy "uh" sound — in casual speech.
ah·TAH·NUH·muhs→ah·TAH·nuh·muhs
Questions
Questions people ask about this.
How is "autonomous" stressed in American English?
Stress falls on the second syllable — say "TAH" with a longer, fuller vowel and keep every other syllable short and quick. The respell "ah-TAH-nuh-muhs" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
Why does the third syllable in "autonomous" 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 "ah-TAH-nuh-muhs" shows the reduced form so you can hear the casual rhythm directly.
Is the American pronunciation of "autonomous" 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 "ah-TAH-nuh-muhs" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
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