Read the dictionary definition of grounds. All definitions for this word.
1. the enclosed land around a house or other building
1. it was a small house with almost no yard
2. your basis for belief or disbelief; knowledge on which to base belief
1. the evidence that smoking causes lung cancer is very compelling
3. a justification for something existing or happening
1. he had no cause to complain
2. they had good reason to rejoice
4. a tract of land cleared for some special purposes (recreation or burial etc.)
5. dregs consisting of solid particles (especially of coffee) that form a residue
1. it is a Middle Eastern custom to read your future in your coffee grounds