Definitions of grounds:

• noun:   a tract of land cleared for some special purposes (recreation or burial etc.)
• noun:   the enclosed land around a house or other building
• noun:   your basis for belief or disbelief; knowledge on which to base belief
• noun:   sediment that has settled at the bottom of a liquid
• noun:   a justification for something existing or happening
• name:  A surname (rare: 1 in 100000 families; popularity rank in the U.S.: #14609)