impenetrability

 [im-pen-i-truh-bil-i-tee, im-pen-]  

im·pen·e·tra·bil·i·ty

   [im-pen-i-truh-bil-i-tee, im-pen-]
noun
1.
the state or quality of being impenetrable.
2.
Physics. that property of matter by virtue of which two bodies cannot occupy the same space simultaneously.
Origin:
1655–65; impenetr(able) + -ability
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source Link To impenetrability

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Impenetrability is always a great word to know.
So is laser. Does it mean:
the amount of a given fissionable material necessary to sustain a chain reaction at a constant rate
a device that produces a nearly parallel, monochromatic, coherent beam of light by exciting atoms to a higher energy level and causing them to radiate
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Collins
World English Dictionary
impenetrable (ɪmˈpɛnɪtrəbəl)
 
—adj
1.  incapable of being pierced through or penetrated: an impenetrable forest
2.  incapable of being understood; incomprehensible: impenetrable jargon
3.  incapable of being seen through: impenetrable gloom
4.  not susceptible to ideas, influence, etc: impenetrable ignorance
5.  physics (of a body) incapable of occupying the same space as another body
 
impenetra'bility
 
—n
 
im'penetrableness
 
—n
 
im'penetrably
 
—adv

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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