المعنى الاصطلاحي :

A title given to the followers of Bābak al-Khurrami, who adopted the view that no religious assignments are due upon the Muslims and claimed the permissibility of fulfilling unlawful desires as well as all other prohibited matters.

الشرح المختصر :

"Al-Muhammirrah" is a title given to the advocates of licentiousness who made the impermissible things permissible. Their name is "Al-Khurramiyyah"; they first appeared in the land of Azerbaijan during the time of Al-Mu‘tasim with Bābak al-Khurrami. The reality about them is that they do not believe in any of the Prophets or Messengers nor any of the divinely revealed Books. They do not affirm that the world has a Creator that created it, nor a religion that He ordered the people to follow, nor that He possesses an abode which he rewards people in based upon their actions in this world. They sometimes base their statement upon the methodologies of the Naturalist philosophers, and at other times they base their statements upon the beliefs of the Magians, who worship light. In addition to that, they follow the doctrine of the "Rāfidah". They were given that name because they dyed their clothes red during the time of Bābak the Magian, the dissolute one whom they followed. This was their slogan in opposition to Banu Al-‘Abbās, out of disagreement with them given that Banu Al-‘Abbās used to wear black. It was also said that they were given this name because they call those who oppose them "hameer" (donkeys). It was also said that they were named thus because their manners and characters resemble that of donkeys. There is nothing that prevents all these to be reasons for their being given this name although the majority of the scholars see the first opinion as the preponderant one.

التعريف اللغوي المختصر :

"Al-Muhammirah": one of the sects of "Al-Khurramiyyah". A member of it is called a "muhammir". It is a name given to those who raise red banners during battles, in contradiction to those who raise black and white banners.