The verbs assure, ensure and insure have the same general meaning–to make certain or more secure–but but are used in very different contexts.
- Assure is something you do to a person or people to ease doubt or anxiety. Example: When we left the neighborhood, my wife assured me I closed the garage door.
- Ensure is something you do to guarantee the security of an event or condition. Example: Our boss wants to continue trimming costs this quarter to ensure we meet our yearly profit projections.
- Insure can be done to a person or thing to limit financial liability and loss. It’s most commonly used in terms of insurance. Example: The event space requires that we hire a fully-insured catering company.