(US) An official document confirming that an applicant for a mortgage has been qualified to borrow a certain amount of money at, or below, a specific interest rate.

(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.

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

plural of letter sheet

The customary certificate of national character which neutral merchant vessels are bound to carry in time of war; a passport for a vessel and cargo.

(UK, historical) A postal letter carried only part of the way to the central post office, and delivered to its destination along the way.

(law) power of attorney

(poetry) The repeated letter or letter sequence in alliteration.

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

plural of letter balance