(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.

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

plural of letter sheet

plural of swash letter

An italic capital letter with top and bottom flourishes, intended to fill an unsightly gap.

plural of side letter

(law) A collective bargaining agreement that is not part of the underlying or primary collective bargaining agreement used by the parties to the contract.

A pair of scales for weighing a letter to determine the cost of postage.