Lethality refers to the state or degree of being deadly or fatal. It's often used in scientific and medical contexts.
When scientists study a new substance or treatment, they might discuss its lethality - how likely it is to cause death if used incorrectly or in high doses. In medicine, doctors will consider a patient's lethality when deciding on a course of treatment for an illness or injury. They'll weigh the risks against the benefits and choose options that are less lethal.
The fact of something being lethal; the ability of something to kill
