(nautical, historical) An official commission from a government authorizing someone to seize the property or people of another nation in reprisal for a similar seizure by a ship from the other nation.

(Singapore) Official notice of a composition fee (a fine).

A formal letter sent to an editor, literary agent or publisher in order to propose an idea for a written work.

plural of letter stock

A post office's implement for defacing a postage stamp. / A stamp for imprinting documents with a date or other information.

plural of letter-stamp

(finance) Synonym of tracking stock

Used other than figuratively or idiomatically: see four-letter: containing four letters. / Consisting of or characterised by swear words and profanity.

(US) Of or relating to a fraternity, sorority, or honor society.

(diplomacy) Formal diplomatic letter that appoints a diplomat as ambassador to another sovereign state.