A war by Muslims against unbelievers or enemies of Islam, carried out as a religious duty.
Origin of jihad
Arabic jihādfromjahadato striveghd in Semitic roots
Mahommed Ahmad (the Sudanese mandi) proclaimed a jihad in 1882.
Thereupon Fodio unfurled the green banner of Mahomet and preached a jihad or religious war.
Mahommedans who do not acknowledge the spiritual authority of the Ottoman sultan, such as the Persians and Moors, look to their own rulers for the proclamation of a jihad; there has been in fact no universal warfare by Moslems on unbelievers since the early days of Mahommedanism.
In the belief of Moslems every one of their number slain in a jihad is taken straight to paradise.
The Crusade was now at last answered by the counter-Crusade - the jihad; for though for many years past Saladin had, in his attempt to acquire all the inheritance of Nureddin, left Palestine unmenaced and intact, his ultimate aim was always the holy war and the recovery of Jerusalem.