Merriam-Webster's Collegiate® Dictionary, 11th Edition
STAMP
I. verb
Etymology: Middle English; akin to Old High German stampfōn to stamp and perhaps to Greek stembein to shake up
Date: 13th century
transitive verb to pound or crush with a pestle or a heavy instrument,
2. a. to strike or beat forcibly with the bottom of the foot, to bring down (the foot) forcibly, to extinguish or destroy by or as if by stamping with the foot,
3. impress , imprint , to attach a stamp to, to cut out, bend, or form with a stamp or die,
5. to provide with a distinctive character , characterize , intransitive verb pound 1, to strike or thrust the foot forcibly or noisily downward,
II. noun
Date: 15th century
a device or instrument for stamping, the impression or mark made by stamping or imprinting,
3. a distinctive character, indication, or mark, a lasting imprint, the act of stamping, a stamped or printed paper affixed in evidence that a tax has been paid, stampless adjective