stamp

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To bring down (the foot) forcibly.
• intransitive verb To bring the foot down onto (an object or surface) forcibly.
• intransitive verb To cause to be dislodged by stomping the feet.
• intransitive verb To subdue, destroy, or eliminate.
• intransitive verb To crush or grind with a heavy instrument.
• intransitive verb To form or cut out by application of a mold, form, or die.
• intransitive verb To imprint or impress with a mark, design, or seal.
• intransitive verb To impress forcibly or permanently.
• intransitive verb To affix an adhesive stamp to (an envelope, for example).
• intransitive verb To identify, characterize, or reveal.
• intransitive verb To thrust the foot forcibly downward.
• intransitive verb To walk with forcible, heavy steps.
• noun The act of stamping.
• noun An implement or device used to impress, cut out, or shape something to which it is applied.
• noun An impression or shape formed by such an implement or device.
• noun An official mark, design, or seal that indicates ownership, approval, completion, or the payment of a tax.
• noun A small piece of gummed paper sold by a government for attachment to an article that is to be mailed; a postage stamp.
• noun A similar piece of gummed paper issued for a specific purpose.
• noun An identifying or characterizing mark or impression.
• noun Characteristic nature or quality.

from The Century Dictionary.

• To crush or bruise with or as with a pestle; pound or bray as in a mortar; pound; bruise; crush: as, to stamp ores in a stamping-mill.
• To strike or beat with a forcible downward thrust of the foot.
• To cause to strike the ground with a sudden or impetuous downward thrust.
• To impress a design or distinctive mark or figure upon; mark with an impression or design: as, to stamp plate with arms; to stamp letters; to stamp butter.
• Hence To certify and give validity or currency to by marking with some mark or impression; coin; mint.
• Figuratively, to brand or stigmatize as being of a specified character; declare to be.
• To imprint; impress; fix deeply: as, to stamp one's name on a book; an event stamped on one's memory.
• To characterize; mark.
• To affix a stamp (as a postage- or receipt-stamp) to: as, to stamp a letter or a newspaper.
• To cut, or cut into various forms, with a stamp: in this sense often with ou : as, to stamp out circles and diamonds from a sheet of metal.
• To strike the foot forcibly downward.
• noun An instrument for crushing, bruising, or pounding; specifically, in metallurgy, that part of the machinery of a stamp-mill which rises and falls, and which delivers the blow by which the ore is reduced to the necessary fineness for being further treated for the separation of the valuable portion; by extension, the mill itself.
• noun An instrument for making impressions on other bodies; an engraved block, die, or the like, by which a mark may be made or delivered by pressure; specifically, a plate upon which is cut the design for the sides or back of a book.
• noun A hand-tool for cutting blanks from paper, leather, etc., in various patterns, according to the shape of the cutting-edges.
• noun A forcible or impetuous downward thrust or blow: as, he emphasized his order with a stamp of the foot.
• noun An impression or mark made with a stamp; an impressed or embossed mark or pattern; particularly, an impressed mark used to certify something, or give validity or currency to it: as, the stamp on a coin; the stamp on a certified check.
• noun Specifically— An official mark set upon a thing chargeable with duty or tax showing that the duty or tax is paid.
• noun The impression of a public mark or seal required by the British government for revenue purposes to be made by its officers upon the paper or parchment on which deeds, legal instruments, bills of exchange, receipts, checks, insurance policies, etc., are written, the fee for the stamp or stamped paper varying with the nature of the instrument or the amount involved. (See stamp-duty.) For receipts, foreign bills of exchange, and agreements, adhesive stamps may be used, but in general the stamp must be embossed or impressed.
• noun A small piece of paper having a certain figure or design impressed upon it, sold by the government to be attached to goods, papers, letters, documents, etc., subject to duty, or to some charge as for postage, in order to show that such duty or charge has been paid: as, postage-stamps; receipt-stamps; internal-revenue stamps.
• noun plural Stamp-duties: as, the receiver of stamps and taxes. See stamp-duty.
• noun plural Money: so called in allusion to the use of postage-stamps and small paper notes (“shinplasters”) as money.
• noun That which is marked; a thing stamped; a medal.
• noun A coin, especially one of small value.
• noun A picture cut in wood or metal, or made by impression; an engraving; a plate or cliché.
• noun Sanction; value derived from suffrage or attestation; authority.
• noun Distinguishing mark; imprint; sign; indication; evidence.
• noun Make; cast; form; character; sort; kind; brand.
• noun In leather manufacturing, a machine for softening hides by pounding them in a vat.