lettre de cachet

let·tre de ca·chet | \ˈle-trə-də-ˌka-ˈshā \
plural lettres de cachet\ˈle-trə(z)-də-ˌka-ˈshā \

Definition of lettre de cachet 

: a letter bearing an official seal and usually authorizing imprisonment without trial of a named person

First Known Use of lettre de cachet

1715, in the meaning defined above

History and Etymology for lettre de cachet

French, literally, letter with a seal

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The first known use of lettre de cachet was in 1715

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