Princeton's WordNet

1. Mujahidin-e Khalq Organization, MKO, MEK, People's Mujahidin of Iran(noun)

   a terrorist organization formed in the 1960s by children of Iranian merchants; sought to counter the Shah of Iran's pro-western policies of modernization and opposition to communism; following a philosophy that mixes Marxism and Islam it now attacks the Islamic fundamentalists who deposed the Shah