English definition of “occur”
/əˈkɜːr/ verb [I] (present participle occurring, past tense and past participle occurred)
› formal to happen, often without being planned: According to the police, the shooting occurred at about 12.30 a.m.
occur in/among, etc sth/sb › to exist or be present in a particular place or group of people: Minerals occur naturally in the Earth's crust. The disease mainly occurs in women over 40.