A neat pile of objects, typically one that is arranged in a regular or orderly manner. She placed the books in a stack on the table.
A large, usually conical pile of hay, straw, or similar material. The farmer built a stack of hay in the field for the livestock.
A chimney, especially one on a factory or a ship. The factory's stack emitted a steady stream of smoke.
A set of shelves for books or other materials arranged closely one above another, as in a library. She spent hours browsing the stacks in the university library.
A data structure in computing that follows the Last In, First Out (LIFO) principle. The programmer used a stack to manage function calls in the application.
Computing: the portion of a computer's memory that stores automatic variables, function parameters, and return addresses, operating in a LIFO manner. The application crashed after a stack overflow occurred.
A steep, often vertical pillar of rock near a coast, formed by wave erosion; a sea stack. Tourists photographed the dramatic stack rising from the waves just offshore.
(informal, usually plural) A large amount or quantity of something, especially money. He made stacks of cash reselling concert tickets.