geocaching
noun/ˈdʒiːəʊkæʃɪŋ/
/ˈdʒiːəʊkæʃɪŋ/
[uncountable]- an activity in which people go out to look for a hidden object (usually a box containing a small item and a record of who has found it) using GPS (= a system that uses signals from satellites to show somebody/something’s position on earth)
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geocaching