A large, disordered pile of things. There was a heap of clothes on the floor that needed to be sorted.
A great deal or large amount of something. She has a heap of experience in the field of marketing.
A dilapidated or run-down vehicle. He drove an old heap that barely made it up the hill.
(Computing) A region of a computer's memory from which dynamically allocated memory is obtained. If the program fails to release objects, the heap will gradually fill up and cause an out-of-memory error.