postage stamp
Abbreviation of 郵便切手. The most common meaning; used for any adhesive stamp for postal use.
See also: 郵便切手
I put a stamp on the letter and dropped it in the mailbox.
merchandise certificate; trading stamp
Abbreviation of 商品切手. A voucher or stamp given by stores that can be collected and exchanged for goods. Less common than the postage stamp sense.
See also: 商品切手
この商店街では、買い物をすると切手がもらえる。
In this shopping district, you get merchandise certificates when you shop.
I put a stamp on the envelope and mailed it at the post office.
You can buy stamps even at a convenience store.
The letter came back because there wasn't enough postage.
I filled out the survey and got a merchandise stamp in return.
切手 is a postage stamp for mailing letters, whereas 印紙 is a revenue stamp affixed to documents to show tax or fee payment.
切手 is the postage stamp itself, while 消印 is the cancellation mark stamped over it to invalidate it.
stamp collecting; philately
stamp collecting