/ˈsɪləbl ||; ˈsɪləbḷ/noun [C] a word or part of a word which contains one vowel sound 音节:
‘Mat’ has one syllable and ‘mattress’ has two syllables. mat有一个音节，mattress有两个音节。The stress in ‘international’ is on the third syllable. international这个词的重音在第三个音节。