Meaning of PYRAMID in English

pyr ‧ a ‧ mid /ˈpɪrəmɪd/ BrE AmE noun [countable]

[ Date: 1500-1600 ; Language: Latin ; Origin: pyramis , from Greek ]

1 . a large stone building with four ↑ triangular (=three-sided) walls that slope in to a point at the top, especially in Egypt and Central America

2 . [usually singular] a system, society, company etc that is organized in different levels, so that there is a small number of people at the top and a much larger number of people at the bottom:

different levels of the management pyramid

At the bottom of the pyramid are the poor.

3 . a pile of objects that have been put into the shape of a pyramid

pyramid of

a pyramid of oranges

4 . an object shaped like a pyramid

—pyramidal /pɪˈræmɪdl/ adjective

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■ types of shapes

▪ square a shape with four straight sides that are equal in length and four angles of 90 degrees

▪ circle a round shape that is like an O

▪ semicircle half a circle

▪ triangle a shape with three straight sides and three angles

▪ rectangle a shape with four straight sides and four angles of 90 degrees

▪ oval a shape like a circle, but that is longer than it is wide

▪ cylinder an object in the shape of a tube

▪ cube a solid object with six equal square sides

▪ pyramid a shape with a square base and four triangular sides that meet in a point at the top

▪ sphere a shape like a ball

Longman Dictionary of Contemporary English.      Longman - Словарь современного английского языка.