adj. 1 expressing or expressed clearly; easy to understand. 2 of or denoting intervals of sanity between periods of insanity or dementia. 3 Bot. with a smooth shining surface. 4 poet. bright. lucidity n. lucidly adv. lucidness n.
[ L lucidus (perh. through F lucide or It. lucido) f. lucere shine (as LUX) ]