Unstressed vowel
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An unstressed vowel is the vowel sound that forms the syllable peak of a syllable that has no lexical stress. In many languages, vowel reduction happens when a vowel changes from stressed to unstressed position, i.e., an unstresed vowel becomes a reduced vowel, such as schwa. As a result, the pronunciation of , e.g., a letter E may significantly differ in the same syllable, but in stressed and unstressed positions. Some other languages, such as Finnish, there is no unstressed vowel reduction.
For English language, see Unstressed and reduced vowels in English.