1. background level the amplitude level of the undesired background noise
  2. ground level the height of the ground on which something stands
  3. background signal extraneous signals that can be confused with the phenomenon to be observed or measured
  4. backgrounder a press conference or interview in which a government official explains to reporters the background of an action or policy
  5. background noise extraneous noise contaminating sound measurements that cannot be separated from the desired signal
  6. background knowledge information that is essential to understanding a situation or problem
  7. backgrounding the execution of low priority programs while higher priority programs are not using the processing system
  8. background the part of a scene behind objects in the front
  9. playground ball ball used in playing softball
  10. compound lever a pair of levers hinged at the fulcrum
  11. background radiation radiation coming from sources other than those being observed
  12. poverty level a level of personal income defining the state of poverty
  13. ground cover low-growing plants planted in deep shade or on a steep slope where turf is difficult to grow
  14. ground beef beef that has been ground
  15. ground wave a radio wave propagated on or near the earth's surface
  16. groundcover low-growing plants planted in deep shade or on a steep slope where turf is difficult to grow
  17. groundless without a basis in reason or fact
  18. groundsel Eurasian weed with heads of small yellow flowers
  19. playground slide plaything consisting of a sloping chute down which children can slide
  20. decompound leaf a leaf having divisions that are themselves compound

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