A love-letter. (Now usually jocular.)

A love letter; a (neatly folded) note. Obsolete.

a letter consisting of three sheets formerly charged triple postage.

A document (esp. one embodying a complaint, remonstrance, or request) having the names of the… In non-nautical use.

More generally: a piece of writing; esp. an informal letter.

Something that tickles or is used for tickling. A stern or severe letter. Cf. tickle, v.1 6b. rare.

a letter submitted in support of an application for something, esp. a job.

(a) a letter sent as a test of the honesty of the messenger; (b) see test-type n. (C.D., Suppl. 1909).

The action of dispatching a messenger or parcel; hence, a mission, errand (archaic). letter of envoy (rare), transl. French lettre d'envoi, a letter…

Services' slang. A letter requesting a reply to previous correspondence.

a letter from an admirer to a celebrity.

A letter sent by air mail; spec. a folding form made of a single sheet of lightweight paper specially designed to be used for this purpose. Cf. air…

An action providing a pleasurable or delicious sensation; love-making; (Naval slang) love-letters. yum-yum girl (euphemistic): a prostitute.

A comparatively informal printed report of topical news or information issued periodically to subscribers or to members of a society, organization…

In plural. Originally and chiefly U.S. gen. colloquial. Overnight reports, figures, etc.