This meaning refers to several objects gathered together in a heap or stack.
There was a pile of clothes on the chair.
She placed the books in a neat pile.
This informal meaning emphasizes that there is a large amount of work, money, or another thing.
I have a pile of work to finish.
The company lost piles of money.
In construction, a pile is a long post used to support a building, bridge, or other structure.
The bridge rests on concrete piles.
Workers drove the piles deep into the riverbed.
