1. ground rent payment for the right to occupy and improve a piece of land
  2. grandparent a parent of your father or mother
  3. groundnut a North American vine with fragrant blossoms and edible tubers; important food crop of Native Americans
  4. groundsheet a waterproofed piece of cloth spread on the ground (as under a tent) to protect from moisture
  5. micronutrient a substance needed only in small amounts for normal body function (e.g., vitamins or minerals)
  6. ground rule (baseball) a special rule (as in baseball) dealing with situations that arise due to the nature of the playing grounds
  7. grounding education or instruction in the fundamentals of a field of knowledge
  8. groundling a playgoer in the cheap, standing section of the theater
  9. groundspeed the speed of an aircraft relative to the ground
  10. reentrant (of angles) pointing inward
  11. ground bait bait scattered on the water to attract fish
  12. ground pine low-growing annual with yellow flowers dotted red
  13. ground pink low wiry-stemmed branching herb or southern California having fringed pink flowers
  14. ground rose low-growing bristly shrub of southern Oregon and California with creeping rootstocks and usually corymbose flowers
  15. concurrent occurring or operating at the same time
  16. ground out make an out by hitting the ball on the ground
  17. grounder (baseball) a hit that travels along the ground
  18. ground state the lowest energy state of an atom or other particle
  19. ground effect apparent increase in aerodynamic lift experienced by an aircraft flying close to the ground
  20. groundbreaking the ceremonial breaking of the ground to formally begin a construction project