1. population shift a change in the relative numbers of the different groups of individuals making up a population
  2. population growth increase in the number of people who inhabit a territory or state
  3. population the people who inhabit a territory or state
  4. population profile a chart showing the number of people as a function of their ages
  5. ventilation shaft a shaft in a building
  6. population scientist a scientist who studies the growth and density of populations and their vital statistics
  7. relationship a mutual connection between people
  8. population control control over the growth of population; a government program
  9. abolitionist a reformer who favors putting an end to slavery
  10. Doppler shift change in the apparent frequency of a wave as observer and source move toward or away from each other
  11. split shift a working shift divided into two periods of time with several hours in between
  12. Population Commission the commission of the Economic and Social Council of the United Nations that is concerned with population control
  13. propulsion system a system that provides a propelling or driving force
  14. publishing the business of issuing printed matter for sale or distribution
  15. isolationist of or relating to isolationism
  16. populist an advocate of democratic principles
  17. popularization the act of making something attractive to the general public
  18. popularisation the act of making something attractive to the general public
  19. depopulation the condition of having reduced numbers of inhabitants
  20. question sheet a written examination