وَهُوَ صِفَةٌ يَتَجَلَّى بِهَا الْمَذْكُورُ لِمَنْ قَامَتْ هِيَ بِهِ
Knowledge is an attribute through which what is mentioned becomes manifest to the one in whom that attribute subsists.
The definition contains three parts. Attribute (ṣifah) describes knowledge as a quality of the knower; the mentioned matter (al-madhkūr) is what can be the object of awareness; and manifestation (tajallī) means that the matter becomes clear to the knower.
Someone who knows that a door is open does more than recite those words. The person apprehends a subject and the condition asserted of it. Verbal expression may convey that knowledge, but is not itself identical with the attribute of knowing.