Affection (linguistics)

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Affection (also known as vowel affection, infection or vowel mutation), in the linguistics of the Celtic languages, is the change in the quality of a vowel under the influence of the vowel of the following final syllable.

It is a type of anticipatory (or regressive) assimilation at a distance. The vowel that triggers the change was later normally lost. Some grammatical suffixes cause i-affection. In Welsh, gair "word" and -iadur "device suffix" yield geiriadur "dictionary", with -ai- in gair becoming -ei-.

The two main types of affection are a-affection and i-affection.^[1] There is also u-affection, which is more usually referred to as u-infection. I-affection is an example of i-mutation and may be compared to the Germanic umlaut, and a-affection is similar to Germanic a-mutation. More rarely, the term "affection", like "umlaut", may be applied to other languages and is then a synonym for i-mutation generally.

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• Metaphony

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