Definition of "Cult" :
noun: an interest followed with exaggerated zeal
noun: a system of religious beliefs and rituals
"Devoted to the cultus of the Blessed Virgin."
noun: a religion or sect that is generally considered to be unorthodox, extremist, or false
"It was a satanic cult."
noun: followers of an unorthodox, extremist, or false religion or sect who often live outside of conventional society under the direction of a charismatic leader
noun: followers of an exclusive system of beliefs and practices