A monophthong is a vowel with no discernable shift in the vowel space within a syllable. In other words, a simple vowel. This contrasts with diphthongs, which are combinations of two vowels in a single syllable.
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- Crystal, D. (2008) Dictionary of Linguistics and Phonetics. 6th Edition. Wiley-Blackwell.
- Matthews, P. H. (1997) The Concise Oxford Dictionary of Linguistics. Oxford: Oxford University Press.