/ Dictionary / Index L lettre de cachet*: Meaning and Definition of Find definitions for: let•tre de ca•chet Pronunciation: (le-tr du ka-she'), [key] — pl. let•tres de ca•chet a letter under the seal of the sovereign, esp. one ordering imprisonment, frequently without trial. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Lettish lettre de change* Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language