An item of mail that cannot be delivered to its intended recipient; after some time it is returned to the sender, or destroyed. / A law or other measure that is no longer enforced.

An agreement, specifically a legally binding contract, reached by the parties' exchange of letters.

plural of cover letter

Written or printed in black letter. / Given to the study of books in black letter; old-fashioned.

(art) The use of letters and other text characters to form a picture.

plural of letter carrier

plural of black letter

(Britain) A cover letter.

plural of covering letter

A dominical letter.