incidence
The frequency or rate at which a particular event occurs.
[C/U] Both
pl: incidences
This term is primarily used in technical, medical, or statistical contexts to describe the emergence of new cases of a condition. It carries a clinical, objective tone and is rarely used in casual conversation to describe everyday occurrences.
Countable when referring to a specific occurrence or a single instance of something happening. Uncountable when referring to the overall statistical rate or frequency of an event.