unemphatic mandatory word elongation (المَدُّ اللاَّزِمُ الكَلِمِيُّ المُخَفَّف)
علوم القرآن
التعريف :
That the long vowel is followed in the same word by a consonant without a short vowel, provided that the consonant is not doubled, as in āālʾāna (10: 51).