WordReference Random House Unabridged Dictionary of American English © 2026
popula′tion pyr′amid, [Sociol.]
  1. Sociologya graph showing the distribution of a population by sex, age, etc.
  • 1945–50

Collins Concise English Dictionary © HarperCollins Publishers::
population pyramid
  1. a pyramid-shaped diagram illustrating the age distribution of a population: the youngest are represented by a rectangle at the base, the oldest by one at the apex

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