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

 

geofence

 noun
(also geo-fence)noun
BrE BrE//ˈdʒiːəʊfens//
 
; NAmE NAmE//ˈdʒiːoʊfens//
 
(technology)
 
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a virtual (2) line that you draw around a physical area so that a signal can be sent to a mobile electronic device such as a phone inside this line or when this line is crossed You can even set up a geofence around a truck and receive an alert if your truck leaves the area.

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