uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
How to pronounce acidity in American English
uh·SIH·duh·tee
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Americans pronounce acidity as uh-SIH-duh-tee (/əˈsɪdəɾi/). In "acidity", 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, and it's why Americans sound more relaxed than the textbook. So instead of uh·SIH·tuh·tee, you get uh·SIH·duh·tee. Stress falls on the second syllable — keep everything else short and quick. You'll hear it in sentences like "The ph scale measures the acidity or alkalinity of a solution".
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Sound by sound
Every sound in "acidity".
4 syllables, 7 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
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.
d/d/
FlapQuickly bounce the front of your tongue against the roof of your mouth. Same as Flap T — a quick tap without stopping airflow.
uh/ʌ/
Relax your lips, jaw, and tongue completely. Drop your jaw slightly and keep the tongue neutral.
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.
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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 "acidity", 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.
uh-SIH-tuh-tee→uh·SIH·duh·tee
02
Stressing the wrong syllable.
Stress falls on the second syllable, not the others. Stretch SIH — keep everything else short and quick.
UH·sih·DUH·TEE→uh·SIH·duh·tee
03
Pronouncing the first syllable too fully.
Don't pronounce the first syllable too fully. The unstressed syllable reduces to a schwa — the lazy "uh" sound — in casual speech.
UH·SIH·duh·tee→uh·SIH·duh·tee
Questions
Questions people ask about this.
How is "acidity" stressed in American English?
Stress falls on the second syllable — say "SIH" with a longer, fuller vowel and keep every other syllable short and quick. The respell "uh-SIH-duh-tee" 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 "acidity"?
In American English, when /t/ sits between two vowels with the second one unstressed, it turns into a quick D-like flap. So "acidity" sounds closer to "uh-SIH-duh-tee" 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 first syllable in "acidity" 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 "uh-SIH-duh-tee" shows the reduced form so you can hear the casual rhythm directly.
Is the American pronunciation of "acidity" 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 "uh-SIH-duh-tee" reflects the casual American form; British dictionaries typically print a citation form with crisper consonants and different vowel choices.
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