postal

Of or relating to a postal system or mail service.

(go postal) To become extremely angry or deranged, especially in an outburst of violence.

Relating to the post or mails; belonging or pertaining to a mail service: as, postal arrangements; postal regulations; postal service.

Called post-cards in the United Kingdom.

A postal card or postal order.

Belonging to the post office or mail service

a card used for transmission of messages through the mails, at a lower rate of postage than a sealed letter; also called postcard. Such cards are sold by the government with postage already paid, or by private vendors without a postage stamp. The message is written on one side of the card, and the address on the other.

See Money order, under Money.

an order payable to bearer, for a sum of money (in the United States less than five dollars under existing law), issued from one post office and payable at another specified office.