Abstraction

Ab`strac´tion

n.	1.	The act of abstracting, separating, or withdrawing, or the state of being withdrawn; withdrawal. A wrongful abstraction of wealth from certain members of the community. - J. S. Mill.
	2.	(Metaph.) The act process of leaving out of consideration one or more properties of a complex object so as to attend to others; analysis. Thus, when the mind considers the form of a tree by itself, or the color of the leaves as separate from their size or figure, the act is called abstraction. So, also, when it considers whiteness, softness, virtue, existence, as separate from any particular objects. Abstraction is no positive act: it is simply the negative of attention. - Sir W. Hamilton.
	3.	An idea or notion of an abstract, or theoretical nature; as, to fight for mere abstractions.
	4.	A separation from worldly objects; a recluse life; as, a hermit's abstraction.
	5.	Absence or absorption of mind; inattention to present objects.
	6.	The taking surreptitiously for one's own use part of the property of another; purloining.
	7.	(Chem.) A separation of volatile parts by the act of distillation.

Noun	1.	abstraction - a concept or idea not associated with any specific instance; "he loved her only in the abstract--not in person" Synonyms: abstract
	2.	abstraction - the act of withdrawing or removing something
	3.	abstraction - the process of formulating general concepts by abstracting common properties of instances Synonyms: generalization, generalisation
	4.	abstraction - an abstract painting
	5.	abstraction - preoccupation with something to the exclusion of all else Synonyms: abstractedness
	6.	abstraction - a general concept formed by extracting common features from specific examples

1.		abstraction - Generalisation; ignoring or hiding details to capture some kind of commonality between different instances. Examples are abstract data types (the representation details are hidden), abstract syntax (the details of the concrete syntax are ignored), abstract interpretation (details are ignored to analyse specific properties).
2.	(programming)	abstraction - Parameterisation, making something a function of something else. Examples are lambda abstractions (making a term into a function of some variable), higher-order function s (parameters are functions), bracket abstraction (making a term into a function of a variable). Opposite of concretisation.

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