a small piece of paper issued by the post office and sold to the public to be attached to the letter, document and packages which will be delivered or mailed.
A stamp is a little square piece of paper that one sticks on envelopes when one is posting something out. Stamps are usually 1st or 2nd class and came in two sizes for large and smaller envelops.
Stamp is also a mark that is put on documents, on ones hand and so forth to verify its credibility, for example 'when paul when to the opening of the nightclub, the bouncers stamped his hand with a pink mark.'
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