Which Latin term denotes a rule or principle that guides behavior?

The term that denotes a rule or principle guiding behavior is "precept." This word originates from the Latin "praeceptum," which means a command or instruction that outlines expected conduct. Precepts are often seen in moral or ethical contexts, serving as fundamental guidelines that influence decision-making and actions. This aligns perfectly with the concept of guiding behavior, as precepts provide a framework for individuals to follow in various situations, reinforcing certain values or standards.

While "principium," meaning principle or beginning, suggests foundational ideas, it's not specifically focused on behavior. "Regula," meaning rule or standard, is closely related but is often more rigid and associated with formal regulations rather than personal guidance. "Doctrina," meaning teaching or doctrine, refers to a body of knowledge or beliefs rather than a specific guiding principle. Therefore, the choice of "precept" best encapsulates the idea of a guiding rule for behavior.