Noun
A
marking
made
by
a
postal
service
on
a
delivery
,
usually
indicating
the
place
where
and
the
date
and
time
when
the
item
was
received
or
processed
for
the
first
time
,
mostly
serving
to
cancel
a
postage stamp
.
Verb
To
apply
a
postmark
on
.