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metaphysics, impenetrability is the name given to that quality of matter whereby two bodies cannot occupy the same space at the same time.The philosopher John Toland argued that impenetrability and extension were sufficient to define matter, a contention strongly disputed by Gottfried Wilhelm von Leibniz.
Locke considered impenetrability to be "more a consequence of
solidity, than solidity itself." 
References This article incorporates text from a publication now in the
public domain: Wood, James, ed. (1907). " ". article name needed . London and New York: Frederick Warne. The Nuttall Encyclopædia Heinemann, F. H. "Toland and Leibniz." The Philosophical Review, Vol. 54, No. 5. (Sep., 1945), pp. 437-457.