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

 

geocache

 noun
noun
BrE BrE//ˈdʒiːəʊkæʃ//
 
; NAmE NAmE//ˈdʒiːoʊkæʃ//
 
 
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an object (usually a box containing a small item and a record of the people who have found it) that is hidden somewhere outdoors and that people look for using GPS (= a system that uses signals from satellites to show somebody/something’s position on earth) in the activity of geocaching Within 30 minutes of walking we arrived at the spot where our first geocache was located.