Source : Webster's Revised Unabridged Dictionary (1913)

Manichaeism \Man"i*ch[ae]*ism\, Manicheism \Man"i*che*ism\, n.
   [Cf. F. manich['e]isme.]
   The doctrines taught, or system of principles maintained, by
   the Manich[ae]ans.

Source : WordNet®

Manichaeism
     n : a religion founded by Manes the third century; a synthesis
         of Zoroastrian dualism between light and dark and
         Babylonian folklore and Buddhist ethics and superficial
         elements of Christianity; spread widely in the Roman
         Empire but had largely died out by 1000 [syn: {Manichaeanism}]