Meaning of “post” - Learner’s Dictionary

post

noun uk us /pəʊst/
SYSTEM [ no plural ] UK (UK/US mail)

A2 the system for sending letters, parcels, etc:

Your letter is in the post.
I'm sending the documents by post.
LETTERS [ U ] UK (UK/US mail)

A2 letters, parcels, etc that you send or receive:

Has the post arrived/come yet?
Did I get any post today?
JOB [ C ] formal

B2 a job:

a part-time post
a teaching post
POLE [ C ]

a long, vertical piece of wood or metal fixed into the ground at one end:

I found the dog tied to a post.
PLACE [ C ]

a place where someone stands to guard something

(Definition of “post noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)