Vowel shift

A vowel shift is a systematic sound change in the pronunciation of the vowel sounds of a language. The best-known example in the English language is the Great Vowel Shift, which began in the 15th century. The Greek language also underwent a vowel shift near the beginning of the Common Era, which included iotacism. Among the Semitic languages, the Canaanite languages underwent a shift in which Proto-Semitic *ā became ō in Proto-Canaanite (a language likely very similar to Biblical Hebrew). A vowel shift can involve a merger of two previously different sounds, or it can be a chain shift. rdf:langString