[loo-sid] /ˈlu sɪd/

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.
[loo-sid-i-tee] /luˈsɪd ɪ ti/
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.
readily understood; clear
shining or glowing
(psychiatry) of or relating to a period of normality between periods of insane or irresponsible behaviour

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).

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

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


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