Definition of aftershock noun from the Oxford Advanced Learner's Dictionary

 

aftershock

 noun
noun
BrE BrE//ˈɑːftəʃɒk//
 
; NAmE NAmE//ˈæftərʃɑːk//
 
Natural disasters
 
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a small earthquake that happens after a bigger one The area suffered a series of aftershocks measuring up to 6.3 on the Richter scale. See related entries: Natural disasters
See the Oxford Advanced American Dictionary entry: aftershock