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A monophthong ( ) is a pure vowel sound, or one whose articulation at beginning and end is relatively fixed, with the tongue moving neither up nor down and neither forward nor backward towards a new position of articulation. A monophthong can be contrasted with a diphthong, where the vowel quality changes (glides from one quality to another) within the same syllable, and with hiatus, where two vowels are next to each other but in different syllables. A vowel sound whose quality does not change over the duration of the vowel is called a pure vowel. The word comes . )
In some languages, due to monophthongization, that originally represented diphthongs now represent monophthongs.
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