post ‧ al /ˈpəʊstl $ ˈpoʊs-/ BrE AmE adjective [only before noun]
[ Word Family: noun : ↑ post , ↑ postage , ↑ postie , ↑ posting ; verb : ↑ post ; adjective : ↑ postal ]
1 . relating to the official system which takes letters from one place to another:
the U.S. postal service
postal workers
an increase in postal charges
2 . relating to sending things by post:
Candidates are chosen by a postal ballot of all party members.
postal vote British English :
Housebound voters should register early for a postal vote.
3 . go postal American English informal to become very angry and behave in a violent way