noun (n)

• a concept or idea not associated with any specific instance(noun.cognition)

  Synonym:
  abstract
  

  source: wordnet30
• the act of withdrawing or removing something(noun.act)

  source: wordnet30
• the process of formulating general concepts by abstracting common properties of instances(noun.cognition)

  Synonym:
  generalisation, generalization
  

  source: wordnet30
• an abstract painting(noun.artifact)

  source: wordnet30
• preoccupation with something to the exclusion of all else(noun.cognition)

  Synonym:
  abstractedness
  

  source: wordnet30
• a general concept formed by extracting common features from specific examples(noun.tops)

  Synonym:
  abstract entity
  

  source: wordnet30
• The act of abstracting, separating, or withdrawing, or the state of being withdrawn; withdrawal.(noun)

  source: webster1913