The story
- Arabic · borrowed fromإمالة
- English todayimala
From Arabic إمالة (ʔimāla, literally “inclination”). The earliest form of the process, described by the Arab grammarians, was conditioned on the existence of an /i/ before or after the /a/ (somewhat similarly to Germanic umlaut). Hence the /a/ was said to “incline” towards the /i/. In many modern dialects, however, imala is only conditioned by surrounding consonants, and it is typically hindered by certain adjacent consonants (especially emphatics).
Etymology from Wiktionary, CC BY-SA 4.0.