occurrence occurrence /əˈkɝːəns/

noun

1. () An event that happens  ( natural event , occurrent , happening , occurrence )
   an event that happens
     The occurrence of earthquakes was common in the region due to its geological activity.
   The occurrence of earthquakes was common in the region due to its geological activity.
   
2. () An instance of something occurring  ( occurrence )
   an instance of something occurring
    A disease of frequent occurrence
   a disease of frequent occurrence
    The occurrence (or presence) of life on other planets
   the occurrence (or presence) of life on other planets