Meaning of “post” - Learner’s Dictionary

post

noun us uk /pəʊst/
The parcel got lost in the post.Have you put the cheque in the post?It's best to reply by post.He sent his application by post.The post is not very reliable in this part of the country.
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)