Meaning of “concrete” in the English Dictionary

"concrete" in British English

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concretenoun [ U ]

uk /ˈkɒŋ.kriːt/ us /ˈkɑːn.kriːt/

B2 a very hard building material made by mixing together cement, sand, small stones, and water:

reinforced concrete
a concrete floor/path
a grey concrete building

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concreteverb [ T ]

uk /ˈkɒŋ.kriːt/ us /ˈkɑːn.kriːt/ UK

concreteadjective

uk /ˈkɒŋ.kriːt/ us /ˈkɑːn.kriːt/

C1 clear and certain, or real and existing in a form that can be seen or felt:

They think she killed her husband, but they have no concrete evidence.
We have a general idea of what we want, but nothing concrete at the moment.

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

"concrete" in American English

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concretenoun [ U ]

us /ˈkɑn·krit, kɑnˈkrit/

concrete noun [ U ] (HARD MATERIAL)

a very hard building material made by mixing together cement (= powdered substance), sand, small stones, and water:

concrete steps

concreteadjective

us /ˈkɑn·krit, kɑnˈkrit/

concrete adjective (CERTAIN)

based on sure facts or existing things rather than guesses or theories:

Police have no concrete evidence linking him to the crime.
We have not yet received a concrete proposal.

English If a statement, argument, or discussion is concrete, it is based on actual things and particular examples.

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