What is vowel reduction?

• A. Unstressed vowels reduce to a mid-central or schwa-like vowel (e.g., /ə/)
• B. Vowels become longer in stressed syllables
• C. Vowels change to diphthongs in unstressed syllables
• D. Vowels become nasalized in connected speech

Answer: (A)

Vowel reduction is when vowels in unstressed syllables lose their full, distinct quality and become a neutral, mid-central sound, most often realized as schwa /ə/. This happens to ease articulation in rapid or casual speech, so the syllable isn’t given the same acoustic prominence as a stressed one. In English, an everyday example is the first vowel in about, which is pronounced as /ə/ rather than a full vowel, and similarly in many unstressed syllables in words like banana, where the vowels tend to reduce to a schwa. The emphasis stays on the stressed parts of the word, while the others are shortened and centralized.

So it’s not about vowels getting longer in stressed syllables, which would increase emphasis rather than reduce it. It’s also not about vowels turning into diphthongs in unstressed positions, which would change their quality in a different way, nor is it about nasalization from surrounding sounds in connected speech. The defining idea is this shift toward a neutral, mid-central vowel in unstressed contexts.