easily understood; completely intelligible or comprehensible: a lucid explanation.
characterized by clear perception or understanding; rational or sane: a lucid moment in his madness.
shining or bright.
clear; pellucid; transparent.

1575–85; < Latin lūcidus, equivalent to lūc-, stem of lūx light1 + -idus -id4

lucidity, lucidness, noun
lucidly, adverb
nonlucid, adjective
nonlucidly, adverb
nonlucidness, noun
unlucid, adjective
unlucidly, adverb
unlucidness, noun

1. plain, understandable, evident, obvious. 2. sound, reasonable. 3. radiant, luminous. 4. limpid.

1, 4. obscure. 2. irrational. 3. dim. 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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1591, "bright, shining," from L. lucidus "light, bright, clear," from lucere "to shine," from lux (gen. lucis) "light," from PIE base *leuk- "to shine, be bright" (see light (n.)). Sense of "easy to understand" first recorded 1786. Lucid interval "period of calm or temporary
sanity" (1581) is from M.L. lucida intervalla (pl.), which was common in medieval Eng. legal documents (cf. non est compos mentis, sed gaudet lucidis intervallis).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

LUCID definition

1. Early query language, ca. 1965, System Development Corp, Santa Monica, CA. [Sammet 1969, p.701].
2. A family of dataflow languages descended from ISWIM, lazy but first-order.
Ashcroft & Wadge , 1981.
They use a dynamic demand driven model. Statements are regarded as equations defining a network of processors and communication lines, through which the data flows. Every data object is thought of as an infinite stream of simple values, every function as a filter. Lucid has no data constructors such as arrays or records. Iteration is simulated with 'is current' and 'fby' (concatenation of sequences). Higher-order functions are implemented using pure dataflow and no closures or heaps.
["Lucid: The Dataflow Language" by Bill Wadge wwadge@csr.UVic.CA and Ed Ashcroft, c. 1985]. ["Lucid, the Dataflow Programming Language", W. Wadge, Academic Press 1985].
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
The moonlight, which seems so lucid and brilliant when you look up, is all
  pearl and smoke round the pond and the hills.
Although the grant has been renewed, the best efforts of the few lucid
  participants have met only cold rebuke.
It's taken years, and in her more lucid moments, she's not even there yet.
Every successive crisis finds him as understanding of others as he is lucid
  about himself, and his impulse is truly magnanimous.
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