Definition of conspiratorialism in English:
conspiratorialism
Pronunciation /kənˌspɪrəˈtɔːrɪəlɪz(ə)m/ /ˌkɒnspɪrəˈtɔːrɪəlɪz(ə)m/
noun
1Participation in conspiracies; conspiratorial activity.
2US Belief in or promotion of conspiracy theories.
Origin
1930s. From conspiratorial + -ism.