a small piece of paper with a picture or pattern on it that is stuck onto a letter or package before it is posted, to show that the cost of sending it has been paid
Collectors value rare and vintage stamps for their historical significance.
The colorful stamp on the envelope depicted a beautiful butterfly in flight.
He went to the post office to buy postage stamps for mailing his letters.
The oversized package required additional postage, indicated by an extra stamp.
