Vowels are often assimilated to vowels that precede or follow in the next syllable. During the early Middle Ages, changes of this kind occurred in several Germanic dialects.These changes in the Germanic languages are known by the name of 'umlaut' [...] - Bloomfield (1935), a pag.381 The commonest type of umlaut is the partial assimilation of a stressed back vowel to a following [i, j]. - Bloomfield (1935), a pag.381
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