plural of comfort letter

(archaic) The letter r.

(computing) An alphabetical identifier assigned to a drive or volume on MS-DOS or Windows.

(US, law) A written agreement between a prosecutor and a defendant or prospective witness, allowing the latter to give the prosecutor information about an alleged crime, while limiting the prosecutor's ability to use that information against them.

plural of proffer letter

(historical) The intellectual community in the late 17th and 18th centuries in Europe and the Americas, exchanging ideas by circulating handwritten letters.

plural of letterfounder

(printing, historical) One who founds or casts letters or types.

(philately) A sheet of paper that may be folded (and often sealed) and mailed without the use of an envelope.

plural of letter sheet