Wiktionary
n. The belief in a messiah.
Wikipedia
Messianism is the belief in a messiah, who acts as a savior, redeemer or liberator of a group of people. The concept of messianism originated in Judaism, and first appeared in the Hebrew Bible, in which a messiah is a king or High Priest traditionally anointed with holy anointing oil. Messianism is most commonly found in Abrahamic religions, including the Jewish Messiah (from which the term and meaning originates), the Christian Messiah called Christ (the Greek translation of the Hebrew root word), and the Muslim Mahdi and Isa (one of the Arabic names for Jesus). Other religions also have a messianism-related concept, including the Buddhist Maitreya, the Hindu Kalki, the Zoroastrian Saoshyant and He whom God shall make manifest in Bábism (believed to be Bahá'u'lláh by Bahais).
Usage examples of "messianism".
It seems likely that messianism formed the principal medium through which angelology impinged on nascent Christology, and that Christ, precisely as messiah, was envisaged as an angel-like spiritual being.
What in the midst of the crisis in the 1920s appeared as transcendence against history, redemption against corruption, and messianism against nihilism now was constructed as an ontologically definite position outside and against, and thus beyond every possible residue of the dialectic.
Ivanov-Razumnik, who had evolved a sort of mystical revolutionary messianism, laying great stress on the revolutionary mission of Russia and on the fundamental difference of Socialist Russia from the bourgeois West.