Longman Dictionary of Contemporary English homepage

ground floor

noun
     
NEW! See related topics: BUILDINGS
ground floor
1 [countable] especially British EnglishTBB the floor of a building that is at ground level [= first floor American English]
a ground floor flat
The dining room is on the ground floor.
floor1 (3)
2

be/get in on the ground floor

to become involved in a plan, business activity etc from the beginning
 
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