1. the rate or frequency at which something occurs or happens
2. the arrival of something at a surface, especially light or other radiation
Usage: physics; technical

Examples

• The incidence of flu cases increased during winter months.
• There has been a high incidence of car accidents on that highway.
• The study examined the incidence of diabetes in different age groups.
• Doctors are concerned about the rising incidence of childhood obesity.
• The angle of incidence affects how light reflects off the mirror.
• Researchers tracked the incidence of the disease over five years.