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conspiration

noun con·spi·ra·tion \ ˌkän(t)-spə-ˈrā-shən , ˌkän-(ˌ)spi-ˈrā- \
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Definition of conspiration

1 : the act or action of plotting or secretly combining
2 : a joint effort toward a particular end
—

conspirational

play \ˌkän(t)-spə-ˈrā-shnəl, -shə-nᵊl, ˌkän-(ˌ)spi-ˈrā-\ adjective

First Known Use of conspiration

14th century

in the meaning defined at sense 1

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