- an official mark stamped on a letter or other postal package, giving the place, date, and time of posting, and serving to cancel the postage stamp邮戳：
the package had a York postmark.
这个包裹上有约克郡的邮戳。
with obj.(一般作be postmarked)
- stamp (a letter or other postal package) officially with such a mark在…上盖邮戳：
with obj. and complement the letter was postmarked New York.这封信上盖有纽约的邮戳。