Relating to or of the nature of a conspiracy; involving secret plotting.
From conspiration or conspire + -ory (adjective suffix). Similar to conspiratorial but formed slightly differently, from the older Latin roots.
In older English texts, 'conspiratory' was more common than 'conspiratorial,' but the -orial form gradually took over—showing how word endings themselves can go in and out of fashion even when the root stays the same.
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