A Kalaami (philosophical) group that appeared in the beginning of the second century Hijri. It began in the first Abbasid Caliphate, and its name refers to two incidents that occurred.

The first was the abandonment (I`tizaal) of its Imaam, Waasil bin `Ataa’, from the audience of al-Hasan al-Basree and the second is because of the statement of Waasil that the one who does a major sin is neither a disbeliever nor a believer, rather, he is in a place in between the two.

When Waasil isolated himself from the sittings of al-Hasan and `Amr bin `Ubaid sat with Waasil, their followers were called the Mu`tazilah. This group relies upon `Aql (logic) and were extreme in that and used it as precedene over Naql (the authentic reports).

Their views concerning the Attributes of Allaah are based on Tateel[denying some or all of Allaah’s Names and Attributes], like the Jahmiyyah, and concerning Qadar [Pre-Decree], like that of the Qadariyyah. They reject the relation of the Qadaa and the Qadar of Allaah on the actions of a human being.