"concrete" in the noun sense
a strong hard building material composed of sand and gravel and cement and water
"concrete" in the verb sense
cover with cement
"concrete the walls"
form into a solid mass coalesce
"concrete" in the adjective sense
capable of being perceived by the senses not abstract or imaginary
"concrete objects such as trees"
formed by the coalescence of particles
Source: WordNet® (An amazing lexical database of English)
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