post
noun
1.
the position where someone (as a guard or sentry) stands or is assigned to stand
2.
military installation at which a body of troops is stationed
4.
an upright consisting of a piece of timber or metal fixed firmly in an upright position
Derived from:
post 5.
any particular collection of letters or packages that is delivered
7.
A message on a social media website
8.
the system whereby messages are transmitted via the post office
Exemplifies:
British English