noun

1. PILE, a nuclear reactor that uses controlled nuclear fission to generate energy
2. PILE, the yarn (as in a rug or velvet or corduroy) that stands up from the weave
3. PILE, a column of wood or steel or concrete that is driven into the ground to provide support for a structure
4. PILE, battery consisting of voltaic cells arranged in series; the earliest electric battery devised by Volta
5. PILE, fine soft dense hair (as the fine short hair of cattle or deer or the wool of sheep or the undercoat of certain dogs)
6. PILE, a collection of objects laid on top of each other
7. PILE, a large sum of money (especially as pay or profit)
8. PILE, (often followed by of') a large number or amount or extent

verb

1. PILE, place or lay as if in a pile
2. PILE, arrange in stacks
3. PILE, press tightly together or cram