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oc‧cur‧rence
1 [countable] something that happens [↪ occurrence]
frequent/rare/common occurrence 
Laughter was a rare occurrence in his classroom.Flooding in the area is a common occurrence.
Laughter was a rare occurrence in his classroom.Flooding in the area is a common occurrence.2 [singular] the fact of something happening
occurrence of The frequent occurrence of earthquakes in the area means that the buildings must be specifically designed to withstand the force.
The frequent occurrence of earthquakes in the area means that the buildings must be specifically designed to withstand the force.