ay/eɪ/
Start with your jaw slightly open and the front of your tongue forward and slightly up. Glide upward, your jaw closes a little more and your tongue arches higher toward the roof of the mouth.
How to pronounce eightieth in American English
AY·tee·uhth
Start here
Americans pronounce eightieth as AY-tee-uhth (/ˈeɪɾiəθ/). In "eightieth", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. This is called the Flap T, the kind of sound shift that makes everyday speech feel effortless. It comes out as AY·tee·uhth. Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "She just celebrated her eightieth birthday".
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Sound by sound
Every sound in "eightieth".
3 syllables, 5 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
t/t/
FlapQuickly bounce the front of your tongue against the roof of your mouth. Don't stop the airflow — just a quick tap.
ee/i/
Pull the corners of your lips back slightly. Arch the middle-front of your tongue high toward the roof of the mouth.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
th/θ/
Place the very tip of your tongue slightly between your teeth. Blow air gently around it without 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
Saying a hard "T" in the middle.
In "eightieth", the "t" between vowels sounds like a quick "d" — the tongue briefly taps the ridge behind the upper teeth. /t/ or /d/ becomes a quick tap [ɾ] — sounds like a soft D. The tongue briefly taps the ridge behind the upper teeth.
AY-tee-uhth→AY·tee·uhth
02
Stressing the wrong syllable.
Stress falls on the first syllable, not the others. Stretch AY — keep everything else short and quick.
ay·TEE·UHTH→AY·tee·uhth
03
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.
AY·tee·UHTH→AY·tee·uhth
Questions
Questions people ask about this.
How is "eightieth" stressed in American English?
Stress falls on the first syllable — say "AY" with a longer, fuller vowel and keep every other syllable short and quick. The respell "AY-tee-uhth" marks the stressed syllable in capitals so the rhythm is easy to read at a glance.
Why doesn't the T sound like a T in "eightieth"?
In American English, when /t/ sits between two vowels with the second one unstressed, it turns into a quick D-like flap. So "eightieth" sounds closer to "AY-tee-uhth" than to a crisp-T pronunciation. This is the flap-T rule, one of the most distinctive sounds of casual American speech.
Why does the third syllable in "eightieth" 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 "AY-tee-uhth" shows the reduced form so you can hear the casual rhythm directly.
Is the American pronunciation of "eightieth" 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 "AY-tee-uhth" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
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