primary stress
US /ˈpraɪ.mer.i ˌstres/
UK /ˈpraɪ.mer.i ˌstres/
1.
the most prominent stress in a word or phrase, typically marked with a raised vertical line before the stressed syllable in phonetic transcription
:
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In the word 'beautiful', the primary stress is on the first syllable, 'beau'.
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Identifying the primary stress is crucial for correct pronunciation.