Imāla
Imāla (also transliterated imālah ; Arabic: إمالة, literally "slanting") is a vowel shift exhibited in many dialects of Arabic, where the open vowel, be it long or short, is raised to [ɛ] or even [e] in certain morphological or phonological contexts. Imāla occurs in modern colloquial as well as classical variants of Arabic, including several qirāʾāt ("styles of recitation") of the Quran. As a very noticeable phenomenon, imāla is often one of the most distinguishing features in dialects in which it occurs, such as Lebanese Arabic.
Classical Arabic
Historically, imāla was a feature of the ancient dialects of Najd and Tamim, where it occurred in both verbs and inflected nouns. There are many cases in which imāla is appropriate; some of the most common are outlined below:
Morphological reasons
It affects a word-final alif when it is substitute for yāʾ , or when it can be substituted by yāʾ in some inflections.
Example: الأعلى ([ælʔæʕleː], "the highest")
Phonological reasons
Just as well, imāla occurs if alif directly follows /j/ or is separated from it by only one letter. This can also occur if they are two letters apart, but the second letter has to be hāʾ . Imāla is generally more tense before long yāʾ that it is before short yāʾ .