a letter sent through the post office.

a letter carried by a private vessel and not by the ordinary mailboat.

General attributive, as penny-post letter, etc.

(a) British a letter conveyed between any two towns which lie on a given post route to London, but not as far as London itself (cf. by-letter n. at…

? A letter dispatched by the night post.

a letter crossing the main routes, and carried by the cross-post.

Short for twopenny post at sense A. 1d: see A. 1d above.

a letter placed in a private box at a post office instead of being sent out and delivered to the addressee.

A letter on which the postage has not been prepaid. Obsolete.

a letter sent by balloon post.

A message delivered by homing pigeon.

a letter handed in at a railway station, to be carried towards its destination on the next available train, for a small fee in addition to the…

A message sent by pneumatic dispatch. Cf. pneumatique, n. Obsolete.

As a count noun: a consignment of mail conveyed by air; (also) = air letter n. at air, n.1 compounds 2.

A telegram conveyed on part of its journey by aeroplane. rare (now disused).

= aerogram, n. 2a.

a letter conveyed by air, esp. one written on a specially designed folding form.

A letter or message sent by the pneumatic post system in Paris (see pneumatic, adj. 2d); (also) this system.

= pneumatique, n.

(a) colloquial mail or post which takes a long time to be delivered; (b) Computing slang (originally U.S.) the physical delivery of mail, as by the…

= aerogram, n. 2b.

a form of airmail registered by Kodak Ltd., in which the correspondent's letter is photographed on a reduced scale; a letter so transmitted.