The present writing is a translation of the entry: Inimitability by Professor Richard C. Martin from the Encyclopedia of the Qur'an. Upon elaborating various derived forms of the term u‘jaz in the Holy Qur'an, the writer proceeds to deal with the history of the idea of inimitability (i‘jāz) in the verses of the Qur'an and the Revelation time, and has presented a report about the history of the Muslims' attempts in the field of the Holy Qur'an's inimitability. He has also stated the opinions and viewpoints of Naẓẓām, Jāḥiẓ, Bāqlānī, Rummānī, ‘Abd al-Jabbār, Jurjānī, and the contemporary scholars, and has pointed out the impacts that their viewpoints have had on one another.