Abstraction in a Sentence 

Definition of Abstraction  

something that exists only as an idea

Examples of Abstraction in a sentence

Morality is an abstraction with no physical form or presence, existing only in the hearts and minds of people.  
There is a plan for eventually colonizing Mars, but with our current level of technology that is merely an abstraction.  
Justice is an abstraction constructed entirely from human thought, with no physical existence in the world itself.  

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