English
geocaching
From geo- + caching.
first attested First attested in 2000 (as stated in the etymology)
The story
First attested in 2000.
Today it means
noun A pastime in which participants use a GPS receiver to find a hidden container at a specific latitude and longitude, or to hide a container to be found in this manner.
Language periods are conventional ranges, not dates for this word.
Etymograph / geocaching