2(in aviation) relating to the ground rather than the air (with particular reference to the maintenance and servicing of aircraft:ground crew
1 [in singular] the solid surface of the earth:he lay on the ground
[mass noun] a limited extent of the earth’s surface; land:an adjoining area of ground had been purchased
[mass noun] land of a specified kind:my feet squelched over marshy ground
British the floor of a room:the device fell to the ground, where it exploded, blowing a hole in the floor
2 (also grounds) an area of land or sea used for a specified purpose:shore dumping can pollute fishing grounds
(grounds) an area of enclosed land surrounding a large house or other building:the house stands in seven acres of groundsthe university grounds
an area of land, often with associated buildings, used for a particular sport:a football groundLiverpool’s new ground is nearing completion
3 [mass noun] an area of knowledge or subject of discussion or thought:third-year courses cover less ground and go into more depth [count noun]:he shifted the argument on to theoretical grounds of his own choosing
4 (grounds) factors forming a basis for action or the justification for a belief:there are some grounds for optimismthey called for a retrial on the grounds of the new evidence
5chiefly Art a prepared surface to which paint is applied.
a substance used to prepare a surface for painting.
(in embroidery or ceramics) a plain surface to which decoration is applied.
a piece of wood fixed to a wall as a base for boards, plaster, or joinery.
6 (grounds) solid particles, especially of coffee, which form a residue; sediment:machines which presoak the coffee grounds produce a superior cup of coffee
7North American electrical connection to the earth.