letter UK /ˈlɛtə/US /ˈlɛtɚ/noun 11verb 2forms 3phrases 3 noun11 •one of the signs used to write words, such as "a", "b" or "c"There are twenty-six letters in the English alphabet. •A written or printed communication, usually defined as longer and more formal than a note. (Sometimes specifically one that is on paper.)I wrote a letter to my sister about my life. •(US) A size of paper, 8½ in × 11 in (215.9 mm × 279.4 mm). •(Canada) A size of paper, 215 mm × 280 mm. •The literal meaning of something, as distinguished from its intended and remoter meaning (the spirit).I broke the letter of it to keep the sense. — 1847 •[in the plural] Literature.Benjamin Franklin was multiskilled – a scientist, politician and a man of letters. •(US) Clipping of varsity letter. •A division unit of a piece of law marked by a letter of the alphabet.Letter (b) constitutes an exception to this provision. •(old-fashioned) A single type; type, collectively; a style of type.Under these, thro’ a garden in which is an ample fountaine, was the King's printing-house, and that famous letter so much esteem’d. — 1644 •One who lets, or lets out. •(no longer used) One who retards or hinders. verb2 •To print, inscribe, or paint letters on something. •(US) To earn a varsity letter (award).I think Mom lettered in shot put her junior year. — 1992 formslettered · lettering · letters Phrases with letter poison-pen letterA missive which is malicious, insulting, and/or defamatory toward a person, organization, or point of view, especially one which is unsigned. red letter dayA day marked in red on calendars; a church feast day. to the letterLiterally, exactly, following the rules as written.