A monophthong (ˈmɒnəfθɒŋ,_ˈmɒnəp- ; , ) is a pure vowel sound, one whose articulation at both beginning and end is relatively fixed, and which does not glide up or down towards a new position of articulation. The monophthongs can be contrasted with diphthongs, where the vowel quality changes within the same syllable, and hiatus, where two vowels are next to each other in different syllables. A vowel sound whose quality does not change over the duration of the vowel is called a pure vowel.
Monophthongization and Vowel breaking
The conversions of monophthongs to diphthongs (diphthongization), and of diphthongs to monophthongs (monophthongization), are major elements of language change and are likely the cause of further changes.
In some languages, due to monophthongization, graphemes that originally represented diphthongs now represent monophthongs.
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In phonology, hiatus, diaeresis (daɪˈɛrəsəs,_-ˈɪər-), or dieresis describes the occurrence of two separate vowel sounds in adjacent syllables with no intervening consonant. When two vowel sounds instead occur together as part of a single syllable, the result is called a diphthong. Some languages do not have diphthongs, except sometimes in rapid speech, or they have a limited number of diphthongs but also numerous vowel sequences that cannot form diphthongs and so appear in hiatus.
In phonetics, a triphthong (UKˈtrɪfθɒŋ,_ˈtrɪpθɒŋ , US-θɔːŋ ) (from Greek τρίφθογγος, "triphthonggos", literally "with three sounds," or "with three tones") is a monosyllabic vowel combination involving a quick but smooth movement of the articulator from one vowel quality to another that passes over a third. While "pure" vowels, or monophthongs, are said to have one target articulator position, diphthongs have two and triphthongs three.