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from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. unobservable

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not observable.

from The Century Dictionary and Cyclopedia

  • Incapable of being directly observed even with the aid of instruments.


Latin inobservabilis : compare French inobservable. See in- not, and observable. (Wiktionary)



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