/ ˈkɒŋkriːt; NAmE ˈkɑːŋ-/ adjective , noun , verb
■ adjective
1.
made of concrete :
a concrete floor
2.
based on facts, not on ideas or guesses :
concrete evidence / proposals / proof
'It's only a suspicion,' she said, 'nothing concrete.'
It is easier to think in concrete terms rather than in the abstract.
—compare abstract (1)
3.
a concrete object is one that you can see and feel
► con·crete·ly adverb
■ noun
[ U ] building material that is made by mixing together cement , sand, small stones and water :
a slab of concrete
■ verb
[ vn ] ~ sth (over) to cover sth with concrete :
The garden had been concreted over.
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WORD ORIGIN
late Middle English (in the sense solidified ): from French concret or Latin concretus , past participle of concrescere grow together. The noun sense building material dates from the mid 19th cent.