Vowel shifts

pronunciation change in English between 1350 and 1700

lengthening of vowel sounds in place of a deleted consonant

sound change that either results in a palatal or palatalized consonant or a front vowel

Iotacism (, iotakismos) or itacism is the process of vowel shift by which a number of vowels and diphthongs converged towards the pronunciation in post-classical Greek and Modern Greek. The term "iotacism" refers to the letter iota, the original sign for , with which these vowels came to merge. The alternative term itacism refers to the new pronunciation of the name of the letter eta as after the change.

change of a monophthong into a diphthong or triphthong

varieties of English spoken in the Southern United States

dialect of American English

Monophthongization is a sound change by which a diphthong becomes a monophthong, a type of vowel shift. It is also known as ungliding, as diphthongs are also known as gliding vowels. In languages that have undergone monophthongization, digraphs that formerly represented diphthongs now represent monophthongs. The opposite of monophthongization is vowel breaking.

metaphony in Germanic languages, occurring around 450–500, in which vowels are raised or fronted when the following syllable contains /i(ː)/ or /j/; e.g. Engl. foot → feet

metaphonic process in late Proto-Germanic (c. 200)