When a word has more than one syllable, a single syllable within the word is given more emphasis than any of the other syllables. That syllable is considered to be the stressed syllable. The vowel sound of the stressed syllable is emphasized by being pronounced longer, louder, and often at a higher pitch than the surrounding syllables.
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Introduction to Syllables
A syllable is a "beat" of spoken word. Every word is at least one syllable in length, and many words have multiple syllables. The number of syllables in a word is easier to discover directly than to have explained. The process of discovery most easily begins with a physical movement of some sort, such as tapping a finger on the table. Tap the table for each syllable in the words below.
Stressed, Unstressed, and Secondarily-Stressed Syllables
Spoken English follows a loose, rhythmic pattern of soft beats. Stressed syllables form the underlying basis of that rhythm. Unstressed and secondarily-stressed syllables are necessary off-beats that fill the space between stressed syllables in spoken English.
Stressed syllable dictionary notation / ˈ/
When a word has more than one syllable, a single syllable within the word is given more emphasis than any of the other syllables. That syllable is considered to be the stressed syllable. The vowel sound of the stressed syllable is emphasized by being pronounced longer, louder, and often at a higher pitch than the surrounding syllables. Vowel sounds of stressed syllables are more likely to be phonetic (pronounced as the spelling would suggest).
The symbol /ˈ/ is used to represent the stressed syllable of a multi-syllable word.
Unstressed syllables and schwa notation /ə/
Within a multi-syllable word, an unstressed syllable is frequently located next to a stressed syllable. Often, this vowel sound is not phonetic (not pronounced the way it is spelled), and is instead pronounced with a quick, neutral vowel sound called schwa. Because schwa is a function of syllable stress and not spelling, schwa can have almost any spelling.
In dictionary transcriptions, the vowel sound schwa is represented with an upside-down e: /ə/.
Secondarily-stressed syllable dictionary notation / ˌ /
Secondarily-stressed syllables most often occur two beats off a main stress. They are given more emphasis than unstressed syllables, but not as much as a stressed syllable. Secondarily stressed syllables are more likely to be pronounced phonetically than unstressed syllables.
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The symbol / ˌ / is used to represent secondarily-stressed syllables of a multi-syllable word.