Definition of "madhhab"

Now some ignorant people claim that they have reached the grade of absolute ijtihâd, that they can draw rules from the Nass and that they no longer need to follow one of the four madhhabs, and they abandon the madhhab they have followed for years.

2016, Mawlana Khalid Baghdadi, Belief and Islam: I'tiqad-Nama, page 55