the quality of being easily understood, completely intelligible, or comprehensible: She makes her argument with pointed logic and exemplary lucidity.
the ability to see things clearly; rationality; sanity: In a rare moment of lucidity, the senator sided with his political enemies for the good of the country.
Sometimes, lucidness.

nonlucidity, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lucid (ˈluːsɪd)
1.  readily understood; clear
2.  shining or glowing
3.  psychiatry of or relating to a period of normality between periods of insane or irresponsible behaviour
[C16: from Latin lūcidus full of light, from lūx light]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

lucidity lu·cid·i·ty (lōō-sĭd'ĭ-tē)
Clarity, especially mental clarity.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Often while thinking that they understand economic reality with total lucidity.
He's at his scariest when he's having a fit of relative lucidity.
But he paints them so attentively and with such a lovingly sensuous touch that
  the images have a breathtaking lucidity.
We went to sleep, and her lucidity wasn't around the next morning.
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