Which of the following best defines a syllable?

A syllable is best defined as a unit of speech that is heard as a single sound. It typically consists of a vowel sound and may include surrounding consonants. Recognizing syllables is essential in understanding the structure of words and how they are pronounced, which in turn aids in reading and phonics instruction.

The other options do not accurately capture the definition of a syllable. For instance, a combination of letters creating one sound relates more to phonemes or digraphs, rather than the broader concept of syllables. A rhythmic pattern in poetry refers to the meter or beat of the poem, which can involve syllables but does not define what a syllable is. Similarly, conveying a word's meaning through connotation pertains to semantics rather than the structural aspect of syllables in spoken language.