1. proper fraction a fraction with a numerator smaller than the denominator
  2. proprioception the ability to sense the position and location and orientation and movement of the body and its parts
  3. pair production the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus
  4. preoccupation the mental state of being obsessed by something
  5. improper fraction a fraction whose numerator is larger than the denominator
  6. group participation participation by all members of a group
  7. proprietary colony a colony given to a proprietor to govern (in 17th century)
  8. nonprescription purchasable without a doctor's prescription
  9. perpetration the act of committing a crime
  10. reprobation severe disapproval
  11. superscription an inscription written above something else
  12. appropriation a deliberate act of acquisition, often without permission
  13. perturbation the act of causing disorder
  14. prescription the action of issuing authoritative rules or directions
  15. proscription rejection by means of an act of banishing or proscribing someone
  16. auditory perception the perception of sound as a meaningful phenomenon
  17. preparation setting in order in advance some act or purpose
  18. propagation the act of producing offspring
  19. verbal description a statement that represents something in words
  20. proportion relation with respect to comparative quantity or magnitude

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