What do a.m. and p.m. stand for?


[im-pen-i-truh-bil-i-tee, im-pen-] /ɪmˌpɛn ɪ trəˈbɪl ɪ ti, ˌɪm pɛn-/
the state or quality of being impenetrable.
Physics. that property of matter by virtue of which two bodies cannot occupy the same space simultaneously.
Origin of impenetrability
1655-65; impenetr(able) + -ability Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for impenetrability
  • Paralleling the untouchability of teaching tools is the impenetrability of modern junk.
  • The protective value of the shield is felt to lie in its supernatural qualities rather than impenetrability.
  • The green abyss is prime gorilla habitat because of its impenetrability.
  • The fascination soon peaked, however, stymied by synesthesia's sheer impenetrability.
  • The pension credit has added a further layer of complexity to a system already notorious for its impenetrability.

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