reference letter

plural of letter writer

A correspondent; a writer of letters. / A person employed to write letters for illiterate people; a person who does this as an occupation.

plural of dominical letter

Any of the first seven letters of the alphabet, used in religious calendars to mark the Sundays throughout the year and determine dates such as Easter Sunday.

plural of letter to the editor

Synonym of letter of comfort

plural of comfort letter

(archaic) The letter r.

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