Definition of stockpiled:
(n) :
A supply (especially a large one) of something kept for future use, specifically in case the cost of the item increases or if there a shortage.
(v) :
(transitive) To accumulate or build up a supply of (something).
(v) :
(intransitive) To build up a supply; to accumulate.
(n) :
(specifically, military, weaponry) A supply of nuclear weapons kept by a country; a nuclear stockpile.
(v) :
(transitive) (specifically, military, weaponry) To build up a stock of (nuclear weapons).
(n) :
(mining) A pile of coal or ore heaped up on the ground after it has been mined.