One way to hold this word: a small circle of people with their heads together, holding a plan that the rest of the room has not been told. Everything the word does comes from that circle. Point it at the real thing and it means the plot itself. Point it at how two friends look across a table and it means they only appear to be in such a circle, briefly and usually for fun. Point it at someone's way of thinking and it means they picture a circle like that behind everything that happens.
From the word’s history
The packet source gives conspirator plus -ial by surface analysis (from Latin conspiratorius), so the word starts out meaning of or belonging to the plotters.
來源資料說這個字來自拉丁文 cōnspīrātōrius 加 -al，從字面拆也可以看成 conspirator 加 -ial。也就是說，它一開始的意思就是「屬於密謀者的」，這正好對上核心畫面裡那一小圈人。
Wiktionary etymology supplied in this packet: From Latin cōnspīrātōrius + -al. By surface analysis, conspirator + -ial.
登入就可以看每一支怎麼連回核心畫面。