Fidā'ī is an Arabic neologism developed in the context of the Arab-Israeli conflict during the 20th century. The term makes the guerilla Palestinian fighter the one who pays with his life the ransom (Fidā) of the national liberation of his fellow citizens. It was largely used during the 1960 and 1970’s through a secular epic carried on by Arab nationalism and revolutionary internationalism. As the most common form of this struggle was the guerrilla (ḥarb al-‘isābāt), al-ḥarb al-fidā'iyya became its synonym. The fidā'ī differs from the fidāwī in the Ismaili tradition.