pyramid (Noun) — A massive monument with a square base and four triangular sides; begun by Cheops around 2700 BC as royal tombs in ancient Egypt.
pyramid (Noun) — A polyhedron having a polygonal base and triangular sides with a common vertex.
pyramid (Noun) — (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.
pyramid (Noun) — A construction in the shape of a pyramid, usually with a square or rectangular base.
pyramid (Verb) — (investing) enlarge one's holdings on an exchange on a continued rise by using paper profits as margin to buy additional amounts.
pyramid (Verb) — (crime) use or deal in (as of stock or commercial transaction) in a pyramid deal.
pyramid (Verb) — Arrange or build up as if on the base of a pyramid.
pyramid (Verb) — Increase rapidly and progressively step by step on a broad base.