1. prime number an integer that has no integral factors but itself and 1
  2. baryon number a number equal to the difference between the number of baryons and the number of antibaryons in any subatomic structure; it is conserved in all types of particle interactions
  3. Brinell number measure of the hardness of a material
  4. page number the system of numbering pages
  5. PIN number a number you choose and use to gain access to various accounts
  6. pyromancer one who practices pyromancy
  7. large number a large indefinite number
  8. prime mover an agent that is the cause of all things but does not itself have a cause
  9. real number any rational or irrational number
  10. prime time the hours between 7 and 11 p.m. when the largest tv audience is available
  11. premonitory warning of future misfortune
  12. promontory a natural elevation
  13. primogeniture right of inheritance belonging exclusively to the eldest son
  14. prime minister head of government, especially of a parliamentary democracy
  15. Prime Minister the person who holds the position of head of the government in the United Kingdom
  16. back-number someone who is no longer popular
  17. Crimean War a war in Crimea between Russia and a group of nations including England and France and Turkey and Sardinia; 1853-1856
  18. primogenitor an ancestor in the direct line
  19. box number the number of a letter box at the post office where mail is collected
  20. barium enema enema in which a contrast medium (usually barium sulfate) is injected into the rectum and X-rays are taken to search for lesions

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