MAHDI Meaning of MAHDI in English [Mah.di] n [Ar mahdiy, lit., one rightly guided] (1800) 1: the expected messiah of Muslim tradition 2: a Muslim leader who assumes a messianic role -- Mah.dism n -- Mah.dist n Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012