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vowel
This term describes a sound characterized by an open flow of air, creating a resonance that forms the nucleus of a syllable. It carries a sense of openness and fluidity, contrasting with the abrupt interruptions or frictions associated with consonants. In linguistic practice, the distinction between a vowel letter and a vowel sound is critical. While a written character may be designated as a vowel, the actual phonetic realization can vary wildly across different languages and dialects, shifting the focus from orthography to acoustics.
Countable when referring to individual letters or sounds in a word, such as saying there are five vowels in the English alphabet.