Final answer:
Nova Scotia has the narrowest definition of workplace violence and aggression among the Canadian provinces listed. It focuses on physical violence, whereas other provinces cover a broader range of behaviors, including harassment.
Step-by-step explanation:
The Canadian province with the narrowest definition of workplace violence and aggression is Nova Scotia. Ontario, Quebec, and Manitoba have more comprehensive definitions that provide broader protections. Nova Scotia's regulations focus primarily on physical violence, while provinces like Ontario have expanded the definition to include risks and attempts at physical force, as well as workplace harassment that can lead to physical and psychological harm.