incidence

US /ˈɪn.sɪ.dəns/
UK /ˈɪn.sɪ.dəns/
"incidence" picture
1.

the occurrence, rate, or frequency of a disease, crime, or other undesirable thing

:
The incidence of measles has decreased significantly due to vaccination.
There was a high incidence of crime in the area last year.
2.

the way in which something happens or arises

:
The incidence of light on the surface affects its color.
We need to study the incidence of various factors on the outcome.