1. perfectibility the capability of becoming perfect
  2. responsibility the social force that binds you to a course of action
  3. perfect participle a participle that expresses completed action
  4. perfective aspect the aspect of a verb that expresses a completed action
  5. predictability the capacity to be known or expected in advance
  6. practicability the quality of being usable
  7. perfectible capable of becoming or being made perfect
  8. permissibility admissibility as a consequence of being permitted
  9. imperfectibility the capability of becoming imperfect
  10. perceptibility the property of being perceptible by the mind or the senses
  11. profitability the quality of affording gain or benefit or profit
  12. perfectionist one displeased by anything that does not meet high standards
  13. purpose-built designed and constructed to serve a particular purpose
  14. probability a measure of how likely it is that some event will occur
  15. irreversibility the quality of being irreversible
  16. reversibility the quality of being reversible in either direction
  17. irresponsibility the trait of lacking trustworthiness or reliability
  18. transposability ability to change sequence
  19. learning disability a disorder found in children of normal intelligence who have difficulties in learning specific skills
  20. perfect pitch the ability to identify the pitch of a tone