1. principal main or most important
  2. principle a basic generalization that is accepted as true
  3. first principle the elementary stages of any subject (usually plural)
  4. in principle with regard to fundamentals although not concerning details
  5. vital principle a hypothetical force to which the functions and qualities peculiar to living things are sometimes ascribed
  6. reality principle the governing principle of the ego
  7. school principal the educator who has executive authority for a school
  8. moral principle the principle that conduct should be moral
  9. bitter principle any one of several hundred compounds having a bitter taste
  10. working principle a rule that is adequate to permit work to be done
  11. life principle a hypothetical force to which the functions and qualities peculiar to living things are sometimes ascribed
  12. legal principle a principle underlying the formulation of jurisprudence
  13. basic principle principles from which other truths can be derived
  14. fundamental principle principles from which other truths can be derived
  15. petitio principii the logical fallacy of assuming the conclusion in the premises; begging the question
  16. accounting principle a principle that governs current accounting practice and that is used as a reference to determine the appropriate treatment of complex transactions
  17. contemporaneously during the same period of time
  18. principally for the most part
  19. unprincipled lacking moral scruples
  20. pleasure principle the governing principle of the id