أما اللمّي: فهو الذي يكون الأوسط فيه علة لثبوت الأكبر للأصغر في الواقع كما أنه واسطة في الحكم
Limmī demonstration is one in which the middle term causes the major predicate to belong to the minor subject in reality, just as it mediates the judgment in reasoning.
The definition requires two functions:
1. The middle term establishes the conclusion in our reasoning.
2. The same middle term explains its truth in reality.
Thus limmī demonstration seeks not just that the conclusion holds, but why it holds.