1. an instance or event of something happening
2. the fact or frequency of something happening

Examples

• The occurrence of earthquakes in this region is rare.
• This was an unusual occurrence that surprised everyone.
• Scientists study the occurrence of certain diseases in different populations.
• The daily occurrence of traffic jams frustrated commuters.
• She reported the strange occurrence to the police.
• The occurrence of rain during the drought was welcomed by farmers.
• Multiple occurrences of the same error suggest a systematic problem.