Meaning of “ground” - Learner’s Dictionary

ground

noun uk us /ɡraʊnd/
the ground

B1 the surface of the Earth:

I sat down on the ground.
SOIL [ U ]

B2 the soil in an area:

soft/stony ground
AREA [ C ]

B1 an area of land used for a particular purpose or activity:

a football ground
KNOWLEDGE [ U ]

an area of knowledge, information, interest, or experience:

He had to go over the same ground several times before I understood it.
→ See also breeding ground , common ground , break new ground , gain/lose ground , get (sth) off the ground , stand your ground , suit sb down to the ground , be thin on the ground

(Definition of “ground noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)