Pyramid (noun)

1. A large structure with a square or triangular base and four triangular sides that meet at a point, typically built as a tomb or monument in ancient Egypt.
2. A similar structure or shape with a broad base and narrow top.

Origin:

From the greek word πυραμίς (pyramis) meaning "wheat cake" or "pyramid" which was later adapted to the latin word pyramidus meaning "pyramid".

Examples:

1. The Great Pyramid of Giza is the oldest of the Seven Wonders of the Ancient World.
2. He climbed to the top of the pyramid to get a better view.
3. The pyramid shape is used in many architectural designs.
4. The company's organizational structure is a pyramid with the CEO at the top.
5. The food pyramid is a guide to healthy eating.