From WordNet (r) 1.6 [wn]:

  abstract
       adj 1: existing only in the mind; separated from embodiment;
              "abstract words like `truth' and `justice'" [ant: {concrete}]
       2: not representing or imitating external reality or the
          objects of nature; "a large abstract painting" [syn: {abstractionist},
           {nonfigurative}, {nonobjective}]
       3: based on specialized theory;  "a theoretical analysis" [syn:
           {theoretical}]
       4: dealing with a subject in the abstract without practical
          purpose or intention; "abstract reasoning"; "abstract
          science"
       n 1: a concept or idea not associated with any specific instance;
            "he loved her only in the abstract--not in person" [syn:
             {abstraction}]
       2: a summary of the main points of an argument or theory [syn:
          {outline}, {synopsis}, {precis}]
       v 1: consider a concept without thinking of a specific example;
            consider abstractly or theoretically
       2: make off with belongings of others [syn: {pilfer}, {cabbage},
           {purloin}, {pinch}, {snarf}, {swipe}, {hook}, {sneak}, {filch},
           {nobble}, {lift}]
       3: consider apart from a particular case or instance; "Let's
          abstract away from this particular example"
       4: give an abstract (of)