1. constituting an actual thing or instance; real: a concrete proof of his sincerity.
  2. pertaining to or concerned with realities or actual instances rather than abstractions; particular (opposed to general): concrete ideas.
  3. representing or applied to an actual substance or thing, as opposed to an abstract quality: The words “cat,” “water,” and “teacher” are concrete, whereas the words “truth,” “excellence,” and “adulthood” are abstract.
  4. made of concrete: a concrete pavement.
  5. formed by coalescence of separate particles into a mass; united in a coagulated, condensed, or solid mass or state.


  1. 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.Compare reinforced concrete.
  2. any of various other artificial building or paving materials, as those containing tar.
  3. a concrete idea or term; a word or notion having an actual or existent thing or instance as its referent.
  4. a mass formed by coalescence or concretion of particles of matter.

verb (used with object), con·cret·ed, con·cret·ing.

  1. to treat or lay with concrete: to concrete a sidewalk.
  2. to form into a mass by coalescence of particles; render solid.
  3. to make real, tangible, or particular.

verb (used without object), con·cret·ed, con·cret·ing.

  1. to coalesce into a mass; become solid; harden.
  2. to use or apply concrete.


  1. set/cast in concrete, to put (something) in final form; finalize so as to prevent change or reversal: The basic agreement sets in concrete certain policies.


    1. a construction material made of a mixture of cement, sand, stone, and water that hardens to a stonelike mass
    2. (as modifier)a concrete slab
  1. physics a rigid mass formed by the coalescence of separate particles


  1. relating to a particular instance or object; specific as opposed to generala concrete example
    1. relating to or characteristic of things capable of being perceived by the senses, as opposed to abstractions
    2. (as noun)the concrete
  2. formed by the coalescence of particles; condensed; solid


  1. (tr) to construct in or cover with concrete
  2. (kənˈkriːt) to become or cause to become solid; coalesce

adj.late 14c., “actual, solid,” from Latin concretus “condensed, hardened, thick, hard, stiff, curdled, congealed, clotted,” figuratively “thick; dim,” literally “grown together;” past participle of concrescere “to grow together,” from com- “together” (see com-) + crescere “to grow” (see crescent). A logicians’ term until meaning began to expand 1600s. Noun sense of “building material made from cement, etc.” is first recorded 1834. adj.

  1. Relating to an actual, specific thing or instance; particular.
  2. Existing in reality or in real experience; perceptible by the senses; real.
  3. Relating to a material thing or group of things as opposed to an abstraction.
  4. Formed by the coalescence of separate particles or parts into one mass; solid.

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