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lucid

[loo-sid] /ˈlu sɪd/
adjective
1.
easily understood; completely intelligible or comprehensible:
a lucid explanation.
2.
characterized by clear perception or understanding; rational or sane:
a lucid moment in his madness.
3.
shining or bright.
4.
clear; pellucid; transparent.
Origin
1575-1585
1575-85; < Latin lūcidus, equivalent to lūc-, stem of lūx light1 + -idus -id4
Related forms
lucidity, lucidness, noun
lucidly, adverb
nonlucid, adjective
nonlucidly, adverb
nonlucidness, noun
unlucid, adjective
unlucidly, adverb
unlucidness, noun
Synonyms
1. plain, understandable, evident, obvious. 2. sound, reasonable. 3. radiant, luminous. 4. limpid.
Antonyms
1, 4. obscure. 2. irrational. 3. dim.

lucidity

[loo-sid-i-tee] /luˈsɪd ɪ ti/
noun
1.
the quality of being easily understood, completely intelligible, or comprehensible:
She makes her argument with pointed logic and exemplary lucidity.
2.
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.
Related forms
nonlucidity, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for lucidness

lucid

/ˈluːsɪd/
adjective
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
Derived Forms
lucidity, lucidness, noun
lucidly, adverb
Word Origin
C16: from Latin lūcidus full of light, from lūx light
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for lucidness

lucid

adj.

1590s, "bright, shining," from Latin lucidus "light, bright, clear," figuratively "perspicuous, lucid, clear," from lucere "to shine," from lux (genitive lucis) "light," from PIE root *leuk- "to shine, be bright" (see light (n.)). Sense of "easy to understand" first recorded 1786. Lucid interval "period of calm or temporary sanity" (1580s) is from Medieval Latin lucida intervalla (plural), which was common in medieval English legal documents (cf. non est compos mentis, sed gaudet lucidis intervallis). Related: Lucidly; lucidness (1640s).

lucidity

n.

1650s, "brightness," from French lucidité, from Late Latin luciditas, from lucidus (see lucid). Meaning "intellectual clarity" attested by 1851.

Online Etymology Dictionary, © 2010 Douglas Harper
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lucidness in Medicine

lucidity lu·cid·i·ty (lōō-sĭd'ĭ-tē)
n.
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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