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  1. optimistic hopeful that the best will happen in the future
  2. atomic power nuclear energy regarded as a source of electricity for the power grid (for civilian use)
  3. optimum most desirable possible under a restriction
  4. optical fiber a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images
  5. optical maser an acronym for light amplification by stimulated emission of radiation; an optical device that produces an intense monochromatic beam of coherent light
  6. opium poppy southwestern Asian herb with greyish leaves and white or reddish flowers; source of opium
  7. optical fibre a very thin fiber made of glass that functions as a waveguide for light; used in bundles to transmit images
  8. epidemic cholera an acute intestinal infection caused by ingestion of contaminated water or food
  9. one-member based on the system of having only one member from each district (as of a legislature)
  10. wind power power derived from the wind (as by windmills)
  11. empower give or delegate authority to
  12. optometry the practice of an optometrist
  13. optimize make optimal; get the most out of; use best
  14. optimism the hopeful feeling that all is going to turn out well
  15. union member a worker who belongs to a trade union
  16. September the month following August and preceding October
  17. tub-thumper a noisy and vigorous or ranting public speaker
  18. committee member a member of a committee
  19. optimal most desirable possible under a restriction
  20. optimise make optimal; get the most out of; use best