(US) A postage stamp with no indicated monetary value and indefinitely valid for a given service, e.g. a domestic first-class letter under 20 grams.

A label resembling a postage stamp, but not issued for postal purposes by a government postal administration.

A postage stamp which includes a premium for charitable causes in addition to the charge for postal service.

A stamp or similar paper document (e.g. coupon) issued to be exchanged in shops or storage facilities for food, or (by extension) for other essential provisions, notably in a rationing system or as a non-financial form of welfare benefit.

A stamp to be affixed as proof that the tax due on the marked product has been paid.

plural of food stamp

plural of revenue stamp

(slang, humorous) A mark left by slapping a person with one's penis.

plural of mushroom stamp

plural of time-stamp