ground

noun:the solid surface of the earth
- The children sat on the ground for their picnic.
noun:an area of land designated for a particular purpose
- The school children gathered on the playground.
noun:the basis or foundation for something, such as an argument or belief
- Her research provided solid ground for her theory.
verb:to prevent an aircraft or pilot from flying
- The storm grounded all flights for 12 hours.
verb:to connect an electrical device to the earth to dissipate excess charge
- The electrician grounded the outlet for safety.
verb:to crush something into small particles or powder
- The mortar and pestle were used to grind the herbs into a paste.
adjective:made into small particles or powder
- We bought a pound of ground beef to make homemade burgers.