1 a large building with a square or TRIANGULAR base and sloping sides that meet in a point at the top. The ancient Egyptians built stone pyramids as places to bury their kings and queens.
2 (geometry) a solid shape with a square or TRIANGULAR base and sloping sides that meet in a point at the top
3 an object or a pile of things that has the shape of a pyramid:
a pyramid of cans in a shop window
4 an organization or a system in which there are fewer people at each level as you get near the top:
a management pyramid
pyramidal adjective
