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