By Mary Morel
Incidence means the rate of occurrence.
The incidence of the disease is increasing.
Incident is an event or action.
During an incident on the yacht race, a man fell overboard.
They can be used to express the same idea, but incidence cannot be made plural and incident can. Incidence is a noncount noun.
The incidence of diseases is increasing. There have been more incidents this year.
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