pyramid definition

1. a polyhedron having a polygonal base and triangular sides with a common vertex
2. (stock market) a series of transactions in which the speculator increases his holdings by using the rising market value of those holdings as margin for further purchases
3. a massive monument with a square base and four triangular sides; begun by Cheops around 2700 BC as royal tombs in ancient Egypt
4. enlarge one's holdings on an exchange on a continued rise by using paper profits as margin to buy additional amounts
5. use or deal in (as of stock or commercial transaction) in a pyramid deal
6. arrange or build up as if on the base of a pyramid
7. increase rapidly and progressively step by step on a broad base