I'jaz (إعجاز) is the Arabic term for the
act of rendering incapable or powerless. In Islamic context, it
is how Muslims describe the character of the Qur'an in both form
and content.
The I'jaz al-Qur'an (in context, inimitability of the Qur'an)
refers to the belief that the Qur'an is of such high quality in
content and form that one is unable to imitate it.