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. private corporation a corporation owned by a few people
  4. proportion relation with respect to comparative quantity or magnitude
  5. improper fraction a fraction whose numerator is larger than the denominator
  6. particular proposition (logic) a proposition that asserts something about some (but not all) members of a class
  7. disproportion imbalance among the parts of something
  8. pair production the transformation of a gamma-ray photon into an electron and a positron when the photon passes close to an atomic nucleus
  9. proposition a suggestion offered for acceptance or rejection
  10. nuclear propulsion the use of a nuclear reactor either to produce electricity to power an engine (as in a nuclear submarine) or to directly heat a propellant (as in nuclear rockets)
  11. appropriation a deliberate act of acquisition, often without permission
  12. trust corporation an organization (usually with a commercial bank) that is engaged as a trustee or fiduciary or agent in handling trust funds or estates of custodial arrangements or stock transfers or related services
  13. preparation setting in order in advance some act or purpose
  14. reprobation severe disapproval
  15. expropriation taking out of an owner's hands
  16. reverberation a remote or indirect consequence of some action
  17. computer operation an elementary operation that a computer is designed and built to perform
  18. private property movable property (as distinguished from real estate)
  19. approbation official acceptance or agreement
  20. closed corporation a corporation owned by a few people