1 [countable] a death in an accident or a violent attack :
a 50% increase in the number of traffic fatalities
a 50% increase in the number of traffic fatalities2 [uncountable] formalMX the fact that a disease is certain to cause death :
The most serious form of skin cancer has a 30 percent fatality rate.
The most serious form of skin cancer has a 30 percent fatality rate.3 [uncountable] formal the feeling that you cannot control what happens to you
