What is ista'azah?

Question
What is ista'azah?

Answer
means to seek refuge or protection.  In the recitation of the Holy Qu'ran, it means seeking refuge with Allah from the rejected Satan. 
Please see the following link for details on in the recitation of the Qur'an. 
http://www.abouttajweed.com/seeking-refuge-and-the-basmalah-in-recitation/seeking-refuge-and-saying-the-basm.html