A syllable is a beat built around a vowel sound. Cat has one syllable, meeting has two, and communication has five. Count what you hear, not the number of written vowels: make has one spoken vowel sound even though it contains two vowel letters.
In a word with two or more syllables, one syllable is usually strongest. It is often longer, clearer, louder, or higher in pitch. Unstressed syllables are lighter and may use the relaxed /ə/ sound. Correct stress often helps recognition more than perfecting every individual sound.