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  1. principle a basic generalization that is accepted as true
  2. principal main or most important
  3. principal sum capital as contrasted with the income derived from it
  4. principal axis a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
  5. renewable resource any natural resource (as wood or solar energy) that can be replenished naturally with the passage of time
  6. principled based on or demonstrating morality or rightness
  7. Parnassia palustris plant having ovate leaves in a basal rosette and white starlike flowers netted with green
  8. prince consort a prince who is the husband of a reigning female sovereign
  9. runcible spoon a fork-like spoon with a cutting edge; coined by Edward Lear
  10. principalship the post of principal
  11. principle of parsimony the principle that entities should not be multiplied needlessly; the simplest of two competing theories is to be preferred
  12. point source a concentrated source that is spatially constricted
  13. passive source an informant who is not assigned to obtain specific intelligence but who routinely passes on whatever information he or she has
  14. primary source a firsthand document that provides information
  15. principality territory ruled by a prince
  16. Pinus palustris large three-needled pine of southeastern United States having very long needles and gnarled twisted limbs; bark is red-brown deeply ridged; an important timber tree
  17. principally for the most part
  18. princess royal the eldest daughter of a British sovereign
  19. Prince Albert prince consort of Queen Victoria of England (1819-1861)
  20. Prince-of-Wales fern New Zealand with pinnate fronds and a densely woolly stalks