Which term refers to advice or a plan?

The term that refers to advice or a plan is "consilium." This Latin word is often associated with deliberation and decision-making, embodying the concept of thoughtful consideration in formulating strategies or providing counsel. In various contexts, it can imply a well-thought-out design or a recommendation made after careful analysis.

In contrast, "coniuratio" refers to a conspiracy or plot, emphasizing clandestine collaboration rather than constructive advice. "Particeps" means a participant or partner, highlighting involvement rather than providing guidance. Lastly, "furor" denotes a state of rage or frenzy, which is quite the opposite of the calm reasoning typically associated with planning or advising. Therefore, "consilium" stands out as the appropriate term for advice or strategic planning.