<p><strong>noun</strong></p><ul><li>an artificial, stonelike material used for various structural purposes, made by mixing cement and various aggregates, as sand, pebbles, gravel, or shale, with water and allowing the mixture to harden.</li><li>any of various artificial building or paving materials, as those containing tar.</li><li>an idea, observation, term, or word having an actual or existent thing or instance as its referent, as opposed to its being abstract: Psychology is all about feelings and behavior, but I’m more interested in the concrete—and that’s why I became a surgeon.</li><li>a mass formed by coalescence or concretion of particles of matter.</li></ul><p><strong>adjective</strong></p><ul><li>constituting an actual thing or instance; real: concrete proof of his sincerity.</li></ul><p><strong>Synonyms</strong></p><ul><li>substantial, factual, solid</li></ul><p><strong>Antonyms</strong></p><ul><li>abstract</li></ul><p><strong>relating to or concerned with realities or actual instances rather than abstractions; particular (general)</strong></p><ul><li>concrete ideas.</li></ul><p><strong>Antonyms</strong></p><ul><li>abstract</li></ul><p><strong>representing or applied to an actual substance or thing, as opposed to an abstract quality:</strong></p><ul><li>The words “cat,” “water,” and “teacher” are concrete, whereas the words “truth,” “excellence,” and “adulthood” are abstract.</li></ul><p><strong>made of concrete:</strong></p><ul><li>a concrete pavement; concrete lawn ornaments.</li></ul><p><strong>formed by coalescence of separate particles into a mass; united in a coagulated, condensed, or solid mass or state.</strong></p><p><strong>verb (used with object)</strong></p><ul><li>concreted, concreting.</li><li>to treat or lay with concrete: to concrete a sidewalk.</li><li>to form into a mass by coalescence of particles; render solid: Of these two semiliquid solutions, which one do you think can be more easily concreted?</li><li>to make real, tangible, or particular.</li></ul><p><strong>verb (used without object)</strong></p><ul><li>concreted, concreting.</li><li>to coalesce into a mass; become solid; harden: Has it started to concrete?</li><li>to use or apply concrete: We can’t begin concreting until all the forms have been installed.</li></ul>