/ Dictionary / Index L Lethe: Meaning and Definition of Find definitions for: Le•the Pronunciation: (lē'thē), [key] — n. a river in Hades whose water caused forgetfulness of the past in those who drank of it. (usually l.c.) forgetfulness; oblivion. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lethe (Thesaurus) Lethbridge lethiferous Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language