a segment of speech that consists of a vowel, with or without one or more accompanying consonant sounds immediately preceding or followingfor example, a, I, out, too, cap, snap, check. A syllabic consonant, such as the final n sound in button and widen, also constitutes a syllable. Closed (checked) syllables are those that end in a consonant; open (free) syllables end in a vowel. The role that syllables play in the production of speech is a matter of considerable debate. So too is any more precise definition of the syllable in phonetics and phonology.
SYLLABLE
Meaning of SYLLABLE in English
Britannica English vocabulary. Английский словарь Британика. 2012