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The Nuttall Encyclopedia
The name given to that quality of matter whereby two bodies cannot occupy the same space at the same time.
Wood, James, ed. Entry for 'Impenetrability'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/i/impenetrability.html. Frederick Warne & Co Ltd. London. 1900.
the Sixth Week after Easter