concrete

A solid mass formed by the coalescence of separate particles; a compound substance, a concretion.

Specifically, a building material created by mixing cement, water, and aggregate such as gravel and sand.

"The road was made of concrete that had been poured in large slabs."

A term designating both a quality and the subject in which it exists; a concrete term.

(usually transitive) To cover with or encase in concrete (building material).

"I hate grass, so I concreted over my lawn."

(usually transitive) To solidify: to change from being abstract to being concrete (actual, real).

To unite or coalesce into a mass or a solid body.

Real, actual, tangible.

"Fuzzy videotapes and distorted sound recordings are not concrete evidence that bigfoot exists."

Being or applying to actual things, not abstract qualities or categories.

Particular, specific, rather than general.

"While everyone else offered thoughts and prayers, she made a concrete proposal to help."