1.nounA store of things that may be required in the future, which can be retrieved rapidly, protected or hidden in some way.
"Members of the 29-man Discovery team laid down food caches to allow the polar team to travel light, hopping from food cache to food cache on their return journey."
2.nounA fast temporary storage where recently or frequently used information is stored to avoid having to reload it from a slower storage medium.
3.noun(geocaching) A container containing treasure in a global treasure-hunt game.