Safety Definitions
The Definition of Hazard
The definition of hazard in safety: hazard is a source, situation, or act with the potential to cause harm to people, property, or the environment.
The definition of hazard in safety: hazard is a source, situation, or act with the potential to cause harm to people, property, or the environment.

A source, situation, or act with the potential to cause harm — whether that's injury or illness to people, damage to property, harm to the environment, or some combination of these.
A spill of chemical solvent on a warehouse floor is a hazard — it doesn't have to cause an injury to be one; it's the potential for harm.