takfir definition
takfir means to regard a Muslim as a non-Muslim;
takfir means: “charging with unbelief”. Takfiris are Muslims who call for other Muslims’ excommunication on grounds that they have in effect abandoned their faith through their practices or their adherence to beliefs eschewed by the Takfiris, who tend to be followers of one particular school in Islam, Salafism. Al-Qaeda in Iraq has repeatedly referred to Shiites as unbelievers. See Crisis Group Report, The Next Iraqi War?, op. cit., pp. 14-17.
takfir means to turn a Muslim into a non-believer of Islamic religion; "taz'ir" means an offence not prescribed by Al-Quran or Hadith;
More Definitions of takfir
takfir means ascribing blasphemy to others. Ibn Taymiyya developed the meaning of polytheism mentioned above, and his mind many religions and Islamic groups out of Islam, and excommunicates them. With this approach, the number of people who are Muslim would be negligible. Some of the groups that Ibn Taymiyya rejects them as heretic include: