1. superfluous more than is needed, desired, or required
  2. poverty level a level of personal income defining the state of poverty
  3. powerfulness possession of controlling influence
  4. Parallel Lives a collection of biographies of famous pairs of Greeks and Romans written by Plutarch; used by Shakespeare in writing some of his plays
  5. pressure level the force applied to a unit area of surface
  6. price level an index that traces the relative changes in the price of an individual good (or a market basket of goods) over time
  7. fuel level the amount of fuel remaining
  8. frivolous not serious in content, attitude, or behavior
  9. powerfully in a powerful manner
  10. biosafety level the level of safety from exposure to infectious agents
  11. powerful having great force or effect
  12. biosafety level 1 exposure only to infectious agents that do not ordinarily cause human disease
  13. biosafety level 4 exposure to exotic infectious agents that pose a high risk of life-threatening disease and can be transmitted as an aerosol and for which there is no vaccine or therapy
  14. biosafety level 2 exposure to infectious agents that can cause disease in humans but whose potential for transmission is limited
  15. biosafety level 3 exposure to infectious agents that can be transmitted by the respiratory route and which can cause serious infection
  16. Percival Lowell United States astronomer whose studies of Mars led him to conclude that Mars was inhabited (1855-1916)
  17. prevalent most frequent or common
  18. powerlessness the quality of lacking strength or power
  19. prevalence the quality of being widespread
  20. order Ulvales an order of protoctist