Postal means to do with the sending of letters and parcels. A postal service, a postal vote, postal charges.
A postal vote is one sent in rather than cast in person, and it has become the way a large share of votes are now cast. In American slang, to go postal means to lose your temper violently, from a series of shootings at postal depots in the 1980s.
1adjectivepostalTo do with the sending of letters and parcels.
“The postal service stopped delivering letters to the island during the storm.”
postal is a quality.
From post plus -al, after French postal. Post comes from Latin positus, placed, through the relay stations of a mail route.
French
postal
English, today
postal
From post + al, modelled on French postal.
Etymology from Wiktionary, CC BY-SA