Pyramid is a monumental structure with a square or triangular base and sloping sides that meet in a point at the top, especially one built of stone as a royal tomb in ancient Egypt.
The term "pyramid" also refers to:
1. A three-dimensional geometric figure with a polygonal base and triangular faces meeting at a common vertex
2. Pyramid scheme - a business model that recruits members via a promise of payments or services for enrolling others into the scheme
3. The Pyramid of Giza - one of the Seven Wonders of the Ancient World
4. Pyramid power - a pseudoscientific belief that pyramid shapes can preserve foods or sharpen razor blades