The Great Vowel Shift was a major change in the pronunciation of Germanic languages, generally accomplished in the 15th century and early 16th century, both in Europe and England. It represented a change in the long vowels (i.e. a vowel shift). In English, the shift began toward the end of the 15th century and was mostly completed in the 16th century, although it continued for some time after that, spreading toward the non-metropolitan and non-port areas.

The values of the long vowels form the main difference between the pronunciation of Middle English and Modern English, and the Great Vowel Shift is one of the historical events marking the separation of Middle and Modern English. Originally, these vowels had "continental" values much like those remaining in liturgical Latin. However, during the Great Vowel Shift, the two highest long vowels became diphthongs, and the other five underwent an increase in tongue height and one of them came to the front.

The principal changes are roughly the following — though exceptions occur, the transitions were not always complete, and there were sometimes accompanying changes in orthography:

This means that the vowel in the English word make was originally pronounced as in modern English father, but has now become a diphthong, as it is today in standard pronunciations of British English (see Received Pronunciation); the vowel in feet was originally pronounced as a long Latin-like e sound; the vowel in mice was originally what the vowel in feet is now; the vowel in boot was originally a long Latin-like o sound; and the vowel in mouse was originally what the vowel in moose is now, but has now become a diphthong.

The Great Vowel Shift was studied by the Danish linguist Otto Jespersen (1860 - 1943).

The shift was remarkable for how widespread it was (going through most of Europe and then Great Britain), as well as its rapidity. The effects of the shift were not entirely uniform, and differences in degree of vowel shifting can sometimes be detected in regional dialects, both in written and spoken English. The surprising speed and the exact cause of the shift are continuing mysteries in linguistics and cultural history.

External links

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• Great created by Melinda J. Menzer and Andrea S. Bean of Furman University
  • "What" from the same site

• "The" page from the Geoffrey Chaucer section of the Harvard University website
• "The" page from Lancaster University's website

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