a strong hard building material composed of sand and gravel and cement and water

cover with cement

form into a solid mass; coalesce

capable of being perceived by the senses; not abstract or imaginary

formed by the coalescence of particles

an area in a city with large modern buildings that is perceived as dangerous and unpleasant

a machine with a large revolving drum in which cement is mixed with other materials to make concrete

a representation of an abstract idea in concrete terms

in concrete terms

the quality of being concrete (not abstract)