From The Collaborative International Dictionary of English v.0.48:

Abstract \Ab"stract`\ (#; 277), a. [L. abstractus, p. p. of
   abstrahere to draw from, separate; ab, abs + trahere to draw.
   See Trace.]
   1. Withdraw; separate. [Obs.]
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            The more abstract . . . we are from the body.
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   2. Considered apart from any application to a particular
      object; separated from matter; existing in the mind only;
      as, abstract truth, abstract numbers. Hence: ideal;
      abstruse; difficult.
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   3. (Logic)
      (a) Expressing a particular property of an object viewed
          apart from the other properties which constitute it;
          -- opposed to concrete; as, honesty is an abstract
          word. --J. S. Mill.
      (b) Resulting from the mental faculty of abstraction;
          general as opposed to particular; as, "reptile" is an
          abstract or general name. --Locke.
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                A concrete name is a name which stands for a
                thing; an abstract name which stands for an
                attribute of a thing. A practice has grown up in
                more modern times, which, if not introduced by
                Locke, has gained currency from his example, of
                applying the expression "abstract name" to all
                names which are the result of abstraction and
                generalization, and consequently to all general
                names, instead of confining it to the names of
                attributes.                       --J. S. Mill.
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   4. Abstracted; absent in mind. "Abstract, as in a trance."
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   An abstract idea (Metaph.), an idea separated from a
      complex object, or from other ideas which naturally
      accompany it; as the solidity of marble when contemplated
      apart from its color or figure.

   Abstract terms, those which express abstract ideas, as
      beauty, whiteness, roundness, without regarding any object
      in which they exist; or abstract terms are the names of
      orders, genera or species of things, in which there is a
      combination of similar qualities.

   Abstract numbers (Math.), numbers used without application
      to things, as 6, 8, 10; but when applied to any thing, as
      6 feet, 10 men, they become concrete.

   Abstract mathematics or Pure mathematics. See
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From The Collaborative International Dictionary of English v.0.48:

Abstract \Ab*stract"\, v. t.
   To perform the process of abstraction. [R.]
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         I own myself able to abstract in one sense. --Berkeley.
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From The Collaborative International Dictionary of English v.0.48:

Abstract \Ab*stract"\, v. t. [imp. & p. p. Abstracted; p. pr.
   & vb. n. Abstracting.] [See Abstract, a.]
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   1. To withdraw; to separate; to take away.
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            He was incapable of forming any opinion or
            resolution abstracted from his own prejudices. --Sir
                                                  W. Scott.
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   2. To draw off in respect to interest or attention; as, his
      was wholly abstracted by other objects.
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            The young stranger had been abstracted and silent.
                                                  --Blackw. Mag.
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   3. To separate, as ideas, by the operation of the mind; to
      consider by itself; to contemplate separately, as a
      quality or attribute. --Whately.
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   4. To epitomize; to abridge. --Franklin.
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   5. To take secretly or dishonestly; to purloin; as, to
      abstract goods from a parcel, or money from a till.
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            Von Rosen had quietly abstracted the bearing-reins
            from the harness.                     --W. Black.
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   6. (Chem.) To separate, as the more volatile or soluble parts
      of a substance, by distillation or other chemical
      processes. In this sense extract is now more generally
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From The Collaborative International Dictionary of English v.0.48:

Abstract \Ab"stract`\, n. [See Abstract, a.]
   1. That which comprises or concentrates in itself the
      essential qualities of a larger thing or of several
      things. Specifically: A summary or an epitome, as of a
      treatise or book, or of a statement; a brief.
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            An abstract of every treatise he had read. --Watts.
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            Man, the abstract
            Of all perfection, which the workmanship
            Of Heaven hath modeled.               --Ford.
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   2. A state of separation from other things; as, to consider a
      subject in the abstract, or apart from other associated
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   3. An abstract term.
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            The concretes "father" and "son" have, or might
            have, the abstracts "paternity" and "filiety." --J.
                                                  S. Mill.
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   4. (Med.) A powdered solid extract of a vegetable substance
      mixed with lactose in such proportion that one part of the
      abstract represents two parts of the original substance.
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   Abstract of title (Law), a document which provides a
      summary of the history of ownership of a parcel of real
      estate, including the conveyances and mortgages; also
      called brief of title.
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   Syn: Abridgment; compendium; epitome; synopsis. See
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