The Collaborative International Dictionary of English v.0.48:

Stamp \Stamp\ (st[a^]mp) v. t. [imp. & p. p. Stamped
   (st[a^]mt; 215); p. pr. & vb. n. Stamping.] [OE. stampen;
   akin to LG. & D. stampen, G. stampfen, OHG. stampf[=o]n, Dan.
   stampe, Sw. stampa, Icel. stappa, G. stampf a pestle and E.
   step. See Step, v. i., and cf. Stampede.]
   1. To strike beat, or press forcibly with the bottom of the
      foot, or by thrusting the foot downward. --Shak.
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            He frets, he fumes, he stares, he stamps the ground.
                                                  --Dryden.
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   2. To bring down (the foot) forcibly on the ground or floor;
      as, he stamped his foot with rage.
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   3. To crush; to pulverize; specifically (Metal.), to crush by
      the blow of a heavy stamp, as ore in a mill.
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            I took your sin, the calf which ye had made, and
            burnt it with fire, and stamped it, and ground it
            very small.                           --Deut. ix.
                                                  21.
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   4. To impress with some mark or figure; as, to stamp a plate
      with arms or initials.
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   5. Fig.: To impress; to imprint; to fix deeply; as, to stamp
      virtuous principles on the heart.
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            God . . . has stamped no original characters on our
            minds wherein we may read his being.  --Locke.
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   6. To cut out, bend, or indent, as paper, sheet metal, etc.,
      into various forms, by a blow or suddenly applied pressure
      with a stamp or die, etc.; to mint; to coin.
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   7. To put a stamp on, as for postage; as, to stamp a letter;
      to stamp a legal document.
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   To stamp out, to put an end to by sudden and energetic
      action; to extinguish; as, to stamp out a rebellion.
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The Collaborative International Dictionary of English v.0.48:

Stamp \Stamp\, v. i.
   1. To strike; to beat; to crush.
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            These cooks how they stamp and strain and grind.
                                                  --Chaucer.
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   2. To strike the foot forcibly downward.
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            But starts, exclaims, and stamps, and raves, and
            dies.                                 --Dennis.
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The Collaborative International Dictionary of English v.0.48:

Stamp \Stamp\, n.
   1. The act of stamping, as with the foot.
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   2. The which stamps; any instrument for making impressions on
      other bodies, as a die.
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            'T is gold so pure
            It can not bear the stamp without alloy. --Dryden.
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   3. The mark made by stamping; a mark imprinted; an
      impression.
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            That sacred name gives ornament and grace,
            And, like his stamp, makes basest metals pass.
                                                  --Dryden.
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   4. That which is marked; a thing stamped.
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            Hanging a golden stamp about their necks. --Shak.
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   5. [F. estampe, of German origin. See Stamp, v. t.] A
      picture cut in wood or metal, or made by impression; a
      cut; a plate. [Obs.]
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            At Venice they put out very curious stamps of the
            several edifices which are most famous for their
            beauty and magnificence.              --Addison.
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   6. An official mark set upon things chargeable with a duty or
      tax to government, as evidence that the duty or tax is
      paid; as, the stamp on a bill of exchange.
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   7. Hence: A stamped or printed device, usually paper, issued
      by the government at a fixed price, and required by law to
      be affixed to, or stamped on, certain papers, as evidence
      that the government dues are paid; as, a postage stamp; a
      tax stamp; a receipt stamp, etc.
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   8. An instrument for cutting out, or shaping, materials, as
      paper, leather, etc., by a downward pressure.
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   9. A character or reputation, good or bad, fixed on anything
      as if by an imprinted mark; current value; authority; as,
      these persons have the stamp of dishonesty; the Scriptures
      bear the stamp of a divine origin.
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            Of the same stamp is that which is obtruded on us,
            that an adamant suspends the attraction of the
            loadstone.                            --Sir T.
                                                  Browne.
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   10. Make; cast; form; character; as, a man of the same stamp,
       or of a different stamp.
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             A soldier of this season's stamp.    --Shak.
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   11. A kind of heavy hammer, or pestle, raised by water or
       steam power, for beating ores to powder; anything like a
       pestle, used for pounding or beating.
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   12. A half-penny. [Obs.] --Beau. & Fl.
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   13. pl. Money, esp. paper money. [Slang, U.S.]
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   Stamp act, an act of the British Parliament [1765] imposing
      a duty on all paper, vellum, and parchment used in the
      American colonies, and declaring all writings on unstamped
      materials to be null and void.

   Stamp collector,
       (a) an officer who receives or collects stamp duties.
       (b) one who collects postage or other stamps, as an
           avocation or for investment; a philatelist.

   Stamp duty, a duty, or tax, imposed on paper and parchment
      used for certain writings, as deeds, conveyances, etc.,
      the evidence of the payment of the duty or tax being a
      stamp. [Eng.]

   Stamp hammer, a hammer, worked by power, which rises and
      falls vertically, like a stamp in a stamp mill.

   Stamp head, a heavy mass of metal, forming the head or
      lower end of a bar, which is lifted and let fall, in a
      stamp mill.

   Stamp mill (Mining), a mill in which ore is crushed with
      stamps; also, a machine for stamping ore.

   Stamp note, a stamped certificate from a customhouse
      officer, which allows goods to be received by the captain
      of a ship as freight. [Eng.]

   Stamp office, an office for the issue of stamps and the
      reception of stamp duties.
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WordNet (r) 3.0 (2006):

stamp
    n 1: the distinctive form in which a thing is made; "pottery of
         this cast was found throughout the region" [syn: cast,
         mold, mould, stamp]
    2: a type or class; "more men of his stamp are needed"
    3: a symbol that is the result of printing or engraving; "he put
       his stamp on the envelope" [syn: stamp, impression]
    4: a small adhesive token stuck on a letter or package to
       indicate that that postal fees have been paid [syn:
       postage, postage stamp, stamp]
    5: something that can be used as an official medium of payment
       [syn: tender, legal tender, stamp]
    6: a small piece of adhesive paper that is put on an object to
       show that a government tax has been paid [syn: revenue
       stamp, stamp]
    7: machine consisting of a heavy bar that moves vertically for
       pounding or crushing ores [syn: stamp, pestle]
    8: a block or die used to imprint a mark or design
    9: a device incised to make an impression; used to secure a
       closing or to authenticate documents [syn: seal, stamp]
    v 1: walk heavily; "The men stomped through the snow in their
         heavy boots" [syn: stomp, stamp, stump]
    2: to mark, or produce an imprint in or on something; "a man
       whose name is permanently stamped on our maps"
    3: reveal clearly as having a certain character; "His playing
       stamps him as a Romantic"
    4: affix a stamp to; "Are the letters properly stamped?"
    5: treat or classify according to a mental stereotype; "I was
       stereotyped as a lazy Southern European" [syn: pigeonhole,
       stereotype, stamp]
    6: destroy or extinguish as if by stamping with the foot; "Stamp
       fascism into submission"; "stamp out tyranny"
    7: form or cut out with a mold, form, or die; "stamp needles"
    8: crush or grind with a heavy instrument; "stamp fruit extract
       the juice"
    9: raise in a relief; "embossed stationery" [syn: emboss,
       boss, stamp]

Moby Thesaurus II by Grady Ward, 1.0:

609 Moby Thesaurus words for "stamp":
   John Hancock, OK, Platonic form, Platonic idea, abolish,
   acceptance, aesthetic form, affirmance, affirmation, amble, animus,
   annihilate, approbation, approval, aptitude, archetype, aroma,
   art form, ascender, attribute, authentication, authorization, back,
   badge, banner, barge, bastard type, beard, bed, belly, bent, bevel,
   bias, billhead, black letter, blaze, blaze a trail, blemish, block,
   block out, blood, blotch, body, body-build, book stamp, bookplate,
   boss, bowl along, brand, breed, bring home to, bring out,
   broad arrow, build, bump, bundle, burin, cachet, cancellation, cap,
   capital, cartouche, carve, case, cast, casting, categorize,
   certification, chalk, chalk up, character, characteristic,
   characteristics, characterize, check, check off, chisel, cicatrize,
   clan, class, classification, classify, clomp, clop, clump,
   coat of arms, colophon, color, complexion, composition, concavity,
   configuration, confirm, confirmation, conformation, constituents,
   constitution, convexity, counter, counterfoil, countermark,
   countersignature, crasis, create, crest, cut, dactylogram,
   dactylograph, dapple, dash, deep-dye, define, delimit, demarcate,
   denominate, denomination, dent, depress, descender, description,
   designate, designation, destroy, device, dharma, diathesis, die,
   differentia, differential, dimple, dint, discolor, disposition,
   distinctive feature, docket, document, dot, drag, drive, drub,
   earmark, eccentricity, efform, eliminate, em, embed, emblem,
   emboss, embossment, en, end, endorsement, engraft, engrave,
   engrave on, engraving tool, entrench, eradicate, escutcheon,
   establish, etch, etching ball, etching ground, etching needle,
   etching point, ethos, excrescence, exterminate, extinguish,
   extirpate, face, fashion, fat-faced type, feather, feature,
   features, feet, fiber, figuration, figure, fingerprint, fix,
   flavor, fleck, flounce, font, foot, footmark, footprint, footslog,
   footstep, forge, form, formalize, format, formation,
   fossil footprint, found, frame, frank, freckle, gash, genius,
   genre, genus, get out, get rid of, go-ahead, government mark,
   government stamp, grade, grain, grave, graver, green light, groove,
   ground, gust, habit, hallmark, halt, hammer, hatch, hectograph,
   hew, hippety-hop, hitch, hobble, hop, hue, humor, humors, ichnite,
   ichnolite, identify, idiocrasy, idiosyncrasy, ilk, image, impact,
   implant, impress, impress upon, impression, imprimatur, imprint,
   inclination, inculcate, indent, indentation, indention, index,
   indicant, indicator, individualism, infix, ingrain, initial,
   initials, inner form, inscribe, insignia, instill, intaglio, issue,
   italic, jam, jog, jolt, jump, keynote, kidney, kill, kin, kind,
   knead, knock out, label, last, lay out, layout, leaning, letter,
   letterhead, letterpress, level, lick into shape, ligature, limp,
   line, lineaments, lodge, log, logo, logotype, lot, lower case,
   lumber, lump, lunge, lurch, mackle, majuscule, make, make a mark,
   make it felt, makeup, manner, mannerism, mark, mark off, mark out,
   marking, masthead, matrix, measure, mental set, mettle, mimeograph,
   mince, mind, mind-set, mint, minuscule, modality, mode, model,
   mold, molding, monogram, mottle, mould, multigraph, name, nature,
   needle, negative, nick, nod, notarization, notch, note, number,
   odor, offcut, offprint, offset, okay, overprint, pace, pack, pad,
   paddle, particularity, pattern, paw print, pawmark, peculiarity,
   peg, pencil, pepper, permission, persuasion, phylum, physique, pi,
   piaffe, piaffer, pica, picture, pimple, pit, plant, plate, plod,
   pock, pockmark, point, postage, postage stamp, postmark, pound,
   prance, predilection, predisposition, preference, press in,
   price tag, prick, print, proclivity, proof, propensity, property,
   prototype, prove, publish, pug, pugmark, pull, pull a proof, punch,
   punch in, punctuate, puncture, put down, put out, put to bed,
   put to press, quality, quell, quirk, race, rack, ratification,
   recess, record, register, registered trademark, reissue,
   representation, representative, repress, reprint, riddle, rocker,
   roll, roman, root, rough out, roughcast, roughhew, rubber stamp,
   run, run off, running head, running title, sanction, sans serif,
   sashay, saunter, savor, scar, scarify, score, scorper, scotch,
   scratch, script, scuff, scuffle, sculpt, sculpture, scuttle, seal,
   seam, seat, service mark, set, set back, set in, setoff, settle,
   shamble, shank, shape, shoe last, shuffle, sidle, sigil, sign,
   signal, signature, signet, significant form, single-foot,
   singularity, skip, slant, slink, slither, slog, slouch, smack,
   small cap, small capital, snuff out, somatotype, sort, specialty,
   species, speck, speckle, spirit, splotch, spot, squelch, stagger,
   stain, stalk, stamp of approval, stamp on, stamp out, stem, step,
   stereotype, sticker, stigmatize, stomp, straddle, straggle, strain,
   streak, striate, stride, strike, stripe, stroll, structure, strut,
   stub, stud, stump, style, subdue, subscription, suchness, suppress,
   sure sign, swagger, swing, symbol, symptom, system, tab, tag,
   tailor, taint, tally, tamp, tang, taste, tattoo, telltale sign,
   temper, temperament, template, tendency, tenor, term, terminate,
   the like of, the likes of, the nod, thermoform, thumbmark,
   thumbprint, tick, tick off, ticket, title page, tittup, toddle,
   token, tone, totter, trace, trade name, trademark, trademark name,
   traipse, trait, traits, tramp, trample, tread, tribe, trick, trip,
   trudge, turn, turn of mind, twist, type, type body, type class,
   type lice, typecase, typeface, typefounders, typefoundry,
   underline, underscore, upper case, validation, variety, vein,
   vestige, visa, vise, waddle, wamble, warp, warrant, way, wedge,
   wiggle, wobble, work



Bouvier's Law Dictionary, Revised 6th Ed (1856):

STAMP, revenue. An impression made on paper, by order of the government,
which must be used in reducing certain contracts to writing, for The purpose
of raising a revenue. Vide Stark. Ev. h.t.; 1 Phil. Ev. 444.
     2. Maryland is the only state in the United States that has enacted a
stamp.