[1] : The Collaborative International Dictionary of English v.0.48

concrete \con"crete\ ? or ?, a. l. concretus, p. p. of
   concrescere to grow together; con- + crescere to grow; cf. f.
   concret. see crescent.
   1. united in growth; hence, formed by coalition of separate
      particles into one mass; united in a solid form.
      1913 webster

            the first concrete state, or consistent surface, of
            the chaos must be of the same figure as the last
            liquid state.                         --bp. burnet.
      1913 webster

   2. logic
      a standing for an object as it exists in nature,
          invested with all its qualities, as distinguished from
          standing for an attribute of an object; -- opposed to
          abstract. hence:
      b applied to a specific object; special; particular; --
          opposed to general. see abstract, 3.
          1913 webster

                concrete is opposed to abstract. the names of
                individuals are concrete, those of classes
                abstract.                         --j. s. mill.
          1913 webster

                concrete terms, while they express the quality,
                do also express, or imply, or refer to, some
                subject to which it belongs.      --i. watts.
          1913 webster

   concrete number, a number associated with, or applied to, a
      particular object, as three men, five days, etc., as
      distinguished from an abstract number, or one used without
      reference to a particular object.

   concrete quantity, a physical object or a collection of
      such objects. --davies  peck.

   concrete science, a physical science, one having as its
      subject of knowledge concrete things instead of abstract
      laws.

   concrete sound or movement of the voice, one which slides
      continuously up or down, as distinguished from a
      discrete movement, in which the voice leaps at once from
      one line of pitch to another. --rush.
      1913 webster
see also:
crescent abstract general abstract concrete number concrete quantity 
concrete science concrete sound or movement of the voice discrete 

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