olemus
mõtteline; mittekonkreetne; üldistuslik
Wiktionary, adj:
3. Not concrete: conceptual, ideal
Synonyms: conceptual, ideal, imaginary, incorporeal, intangible, nonempirical, theoretical
Antonyms: actual, concrete, corporeal, empirical

ülevaateid
https://en.wikipedia.org/wiki/Abstract_and_concrete
https://en.wikipedia.org/wiki/Abstraction
https://en.wikipedia.org/wiki/Abstraction_(disambiguation)
https://en.wikipedia.org/wiki/Abstraction_(computer_science)