Syllable
Syllable is a single unit of speech, either a whole word or one of the parts into which a word can be separated, usually containing a vowel.
A syllable is a part of a word that contains a single vowel sound and that is pronounced as a unit. So, for example, 'book' has one syllable, and 'reading' has two syllables.
Cambridge Dictionary. (1995). Cambridge University Press. Retrieved from: https://bit.ly/3tYBPdx
Collins English Dictionary. (1979). HarperCollins Publishers, Retrieved from: https://www.collinsdictionary.com/dictionary/english/syllable