1. prime number an integer that has no integral factors but itself and 1
  2. prominent conspicuous in position or importance
  3. 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
  4. Brinell number measure of the hardness of a material
  5. page number the system of numbering pages
  6. promontory a natural elevation
  7. PIN number a number you choose and use to gain access to various accounts
  8. pyromancer one who practices pyromancy
  9. real number any rational or irrational number
  10. perimeter a line enclosing a plane area
  11. prime mover an agent that is the cause of all things but does not itself have a cause
  12. premonitory warning of future misfortune
  13. large number a large indefinite number
  14. prime time the hours between 7 and 11 p.m. when the largest tv audience is available
  15. primogeniture right of inheritance belonging exclusively to the eldest son
  16. prime minister head of government, especially of a parliamentary democracy
  17. premonition an early warning about a future event
  18. primer an introductory textbook
  19. prominence the state of being widely known or eminent
  20. primogenitor an ancestor in the direct line