1. A solid figure with a polygonal base and triangular faces that meet at a common point. 2. Something shaped like this polyhedron. 3. A massive monument of ancient Egypt having a rectangular base and four triangular faces culminating in a single apex, built over or around a crypt or tomb. 4. Any of various similar constructions, especially a four-sided Mayan temple having stepped sides and a flat top surmounted by ceremonial chambers. 5. The transactions involved in pyramiding stock. 6. A structure or part suggestive of a pyramid in shape. 7. To place or build in the shape of a pyramid. 8. To build (an argument or a thesis, for example) progressively from a basic general premise. 9. To speculate in (stock) by making a series of buying and selling transactions in which paper profits are used as margin for buying more stock. 10. To assume the shape of a pyramid. 11. To increase rapidly and on a widening base. 12. To pyramid stocks.
