concrete

adj. tangible, real, substantial

n. stonelike building material (containing cement, gravel, water, etc.); something tangible (idea, object, etc.)

v. solidify; set or cover in concrete

Concrete is a construction material that consists of cement (commonly Portland cement) as well as other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate such as gravel limestone or granite, plus a fine aggregate such as sand or manufactured sand and water) and chemical admixtures.
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Noun
1. a strong hard building material composed of sand and gravel and cement and water
(hypernym) building material
(hyponym) cement
(substance-meronym) cement
Verb
1. cover with cement; "concrete the walls"
(hypernym) cover
2. form into a solid mass; coalesce
(hypernym) solidify
(derivation) compaction, compression, concretion, densification
Adjective
1. capable of being perceived by the senses; not abstract or imaginary; "concrete objects such as trees"
(antonym) abstract
(similar) factual
(see-also) tangible
(attribute) concreteness
2. formed by the coalescence of particles
(similar) solid

adj. concrete, positive

adj. concrete, real, tangible, substantial