Meaning of “the ground floor” in the English Dictionary

"the ground floor" in British English

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the ground floornoun [ S ]

uk /ˌɡraʊnd ˈflɔːr/ us /ˌɡraʊnd ˈflɔːr/ UK US usually first floor

B1 the floor of a building that is at the same level as the ground outside:

My office is on the ground floor.

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ground-floor
adjective [ before noun ] uk /ˌɡraʊndˈflɔːr/ us /-ˈflɔːr/

a ground-floor office

(Definition of “the ground floor” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ground floor" in American English

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ground floornoun [ U ]

/ˈɡrɑʊnd ˈflɔr, ˈfloʊr/ also first floor

the floor in a building that is nearest the level of the ground

(Definition of “ground floor” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"ground floor" in Business English

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ground floornoun [ S ]

uk us
get/be in on the ground floor

to be involved in a project or business activity from the beginning:

Get in on the ground floor of this booming industry now!

(Definition of “ground floor” from the Cambridge Business English Dictionary © Cambridge University Press)