Noun

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

Verb

1. Enlarge one's holdings on an exchange on a continued rise by using paper profits as margin to buy additional amounts
2. Use or deal in (as of stock or commercial transaction) in a pyramid deal
3. Arrange or build up as if on the base of a pyramid
4. Increase rapidly and progressively step by step on a broad base