safety
The French word 'sécurité' translates to 'safety' in English. It is used in the context of ensuring freedom from danger or risks. For example, you might hear it used in phrases about road safety ('sécurité routière') or job safety ('sécurité de l'emploi').
Safety is a priority in this company
This sentence means that the company highly values the safety of their workers, clients, products, and/or operations. They do everything that's necessary to avoid risks and accidents.
You must wear your seatbelt
In this statement, the speaker is requesting or insisting that the listener should wear a seatbelt, usually because they're about to drive or travel by car, and wearing a seatbelt significantly boosts the odds of survival or reducing injury in an accident.
The security system has detected a threat
This sentence suggests that a security system (which could be a computer network security, a home alarm system, or even a national defense system) has identified a potential danger or intrusion.