Meaning

• A mass of things heaped together; a heap.

• A group or list of related items up for consideration, especially in some kind of selection process.

  "When we were looking for a new housemate, we put the nice woman on the "maybe" pile, and the annoying guy on the "no" pile"

• A mass formed in layers.

  "a pile of shot"

• A funeral pile; a pyre.

• A large amount of money.

  "He made a pile from that invention of his."

• A large building, or mass of buildings.

• A bundle of pieces of wrought iron to be worked over into bars or other shapes by rolling or hammering at a welding heat; a fagot.

• A vertical series of alternate disks of two dissimilar metals (especially copper and zinc), laid up with disks of cloth or paper moistened with acid water between them, for producing a current of electricity; a voltaic pile, or galvanic pile.

• An atomic pile; an early form of nuclear reactor.

• The reverse (or tails) of a coin.

• A list or league

Meaning

• (often used with the preposition "up") To lay or throw into a pile or heap; to heap up; to collect into a mass; to accumulate

  "They were piling up wood on the wheelbarrow."

• To cover with heaps; or in great abundance; to fill or overfill; to load.

  "We piled the camel with our loads."

• To add something to a great number.

• (of vehicles) To create a hold-up.

• To place (guns, muskets, etc.) together in threes so that they can stand upright, supporting each other.