I like this definition from the Cult Information Centre:
1. It uses psychological coercion to recruit, indoctrinate and retain its members
2. It forms an elitist totalitarian society
3. Its founder leader is self-appointed, dogmatic, messianic, not accountable and has charisma
4. It believes 'the end justifies the means' in order to solicit funRAB
recruit people
5. Its wealth does not benefit its members or society