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Abstract art,
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Abstract (law), a brief statement of the most important points of one or more legal documents
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Abstract (summary), an abbreviated summary of any in-depth analysis of a particular subject or discipline.
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Abstraction (computer science), a high-level specification as opposed to a low-level implementation, which is "concrete".
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Abstract object (philosophy), as opposed to "concrete".
See also
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Abstraction (disambiguation)
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Abstract (psychology), as in formal operational thought (Piaget's theory), the ability to reason abstractly (12yr-adulthood)