A theory as to why a major or minor event has occurred.
The theory may be truthful, or at least
plausible, but the message of said theory may be propagated with fear, suspicion, and paranoia.
It is to note that conspiracy is NOT synonymous with truth, as some would like you to believe.
Conspiracies may also be
deceitful as well, though they may seem
to be completely honest.
9/11 is supposedly an
inside job, even though people seem to forget that thousands of FBI agents, firefighters, demolition experts, scientists, CIA, rescue workers, police, airline pilots, NSA, The majority of the House Of Representatives,
air traffic control, and the entire
Bush administration would undoubtedly know about it and yet refuse to expose it.
Hence being a conspiracy