Definition of conspiracism in US English:

conspiracism

noun

  • The belief that major historical and political events are brought about as the result of a conspiracy between interested parties, or are manipulated by or on behalf of an unknown group of influential people; belief in or advocacy of conspiracy theories.

Origin

1980s. From conspiracy + -ism. Compare earlier conspiracist.

Pronunciation

conspiracism

/kənˈspɪrəsɪz(ə)m/