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Wordnet 3.0

NOUN (4)

1. preserve of crushed fruit;

2. informal terms for a difficult situation;
- Example: "he got into a terrible fix"
- Example: "he made a muddle of his marriage"
[syn: fix, hole, jam, mess, muddle, pickle, kettle of fish]

3. a dense crowd of people;
[syn: crush, jam, press]

4. deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems;
[syn: jamming, electronic jamming, jam]


VERB (7)

1. press tightly together or cram;
- Example: "The crowd packed the auditorium"
[syn: throng, mob, pack, pile, jam]

2. push down forcibly;
- Example: "The driver jammed the brake pedal to the floor"

3. crush or bruise;
- Example: "jam a toe"
[syn: jam, crush]

4. interfere with or prevent the reception of signals;
- Example: "Jam the Voice of America"
- Example: "block the signals emitted by this station"
[syn: jam, block]

5. get stuck and immobilized;
- Example: "the mechanism jammed"

6. crowd or pack to capacity;
- Example: "the theater was jampacked"
[syn: jam, jampack, ram, chock up, cram, wad]

7. block passage through;
- Example: "obstruct the path"
[syn: obstruct, obturate, impede, occlude, jam, block, close up]


The Collaborative International Dictionary of English v.0.48:

Jam \Jam\, n. 1. A mass of people or objects crowded together; also, the pressure from a crowd; a crush; as, a jam in a street; a jam of logs in a river. [1913 Webster] 2. An injury caused by jamming. [Colloq.] [1913 Webster] 3. A difficult situation; as, he got himself into a jam. [informal] [PJC]
The Collaborative International Dictionary of English v.0.48:

Jam \Jam\, n. [Prob. fr. jam, v.; but cf. also Ar. jamad ice, jelly, j[=a]mid congealed, jamd congelation, ice.] A preserve of fruit boiled with sugar and water; also called jelly; as, raspberry jam; currant jam; grape jam. [1913 Webster] Jam nut. See Check nut, under Check. Jam weld (Forging), a butt weld. See under Butt. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Jam \Jam\ (j[a^]m), n. [Per. or Hind. j[=a]mah garment, robe.] A kind of frock for children. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Jam \Jam\, n. (Mining) See Jamb. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Jam \Jam\, v. t. [imp. & p. p. Jammed (j[a^]md); p. pr. & vb. n. Jamming.] [Either fr. jamb, as if squeezed between jambs, or more likely from the same source as champ See Champ.] [1913 Webster] 1. To press into a close or tight position; to crowd; to squeeze; to wedge in; to cram; as, rock fans jammed the theater for the concert. [1913 Webster] The ship . . . jammed in between two rocks. --De Foe. [1913 Webster] 2. To crush or bruise; as, to jam a finger in the crack of a door. [Colloq.] [1913 Webster] 3. (Naut.) To bring (a vessel) so close to the wind that half her upper sails are laid aback. --W. C. Russell. [1913 Webster] 4. To block or obstruct by packing too much (people or objects) into; as, shoppers jammed the aisles during the fire sale. [PJC] 5. (Radio) To interfere with (a radio signal) by sending other signals of the same or nearby frequency; as, the Soviets jammed Radio Free Europe broadcasts for years during the cold war. [PJC] 6. To cause to become nonfunctional by putting something in that blocks the movement of a part or parts; as, he jammed the drawer by putting in too many loose papers; he jammed the lock by trying to pick it. [PJC]
The Collaborative International Dictionary of English v.0.48:

Jam \Jam\, v. i. 2. To become stuck so as not to function; as, the copier jammed again. [PJC] 2. (Music) To play an instrument in a jam session. [PJC] 3. To crowd together; -- usually used with together or in; as, fifty people jammed into a conference room designed for twenty. [PJC]
WordNet (r) 3.0 (2006):

jam n 1: preserve of crushed fruit 2: informal terms for a difficult situation; "he got into a terrible fix"; "he made a muddle of his marriage" [syn: fix, hole, jam, mess, muddle, pickle, kettle of fish] 3: a dense crowd of people [syn: crush, jam, press] 4: deliberate radiation or reflection of electromagnetic energy for the purpose of disrupting enemy use of electronic devices or systems [syn: jamming, electronic jamming, jam] v 1: press tightly together or cram; "The crowd packed the auditorium" [syn: throng, mob, pack, pile, jam] 2: push down forcibly; "The driver jammed the brake pedal to the floor" 3: crush or bruise; "jam a toe" [syn: jam, crush] 4: interfere with or prevent the reception of signals; "Jam the Voice of America"; "block the signals emitted by this station" [syn: jam, block] 5: get stuck and immobilized; "the mechanism jammed" 6: crowd or pack to capacity; "the theater was jampacked" [syn: jam, jampack, ram, chock up, cram, wad] 7: block passage through; "obstruct the path" [syn: obstruct, obturate, impede, occlude, jam, block, close up] [ant: disengage, free]
Moby Thesaurus II by Grady Ward, 1.0:

546 Moby Thesaurus words for "jam": Great Mogul, Jell-O, Mogul, a mass of, a world of, abound with, afterthought, albumen, arch dam, army, articulate, assault, backstop, baffle, bafflement, bamboo curtain, bank, bar, barrage, barricade, barrier, batten, batten down, batter, be alive with, beam, bear, bear upon, bear-trap dam, bearings, beaver dam, bed, bevy, bewilderment, bind, blancmange, blank wall, blind alley, blind gut, block, block up, blockade, blockage, bolt, bonnyclabber, boom, boost, bother, bottleneck, box, breakwater, breastwork, brick wall, brim, bristle with, buck, buckle, buffer, bulkhead, bull, bulldoze, bulwark, bump, bump against, bunch, bung, bunt, bureaucratic delay, burst with, butt, butt against, butter, button, candy, case, catch, caulk, cecum, charge, chink, chock, choke, choke off, choke up, choking, choking off, circumstance, clabber, clasp, cleat, clip, clog, clog up, close, close off, close tight, close up, cloud, cluster, clutch, clutter, cofferdam, cohue, comfit, compact, complication, compote, compress, concentrate, condense, condition, confection, confectionery, confirm, confiture, confoundment, confusion, congest, congestion, conserve, consolidate, constipate, constipation, constrict, cork, corner, cornstarch, costiveness, cover, covey, cram, crawl with, cream, creep with, crowd, crunch, crush, cul-de-sac, curd, dam, dam up, dead end, debar, deep-dye, defense, define, delay, delayage, delayed reaction, deluge, densen, densify, detention, dig, dike, dilemma, discomposure, disconcert, disconcertedness, disconcertion, disconcertment, disturbance, ditch, dog, double take, dough, dovetail, dragging, drench, drive, drown out, earthwork, egg white, elbow, embankment, embarrassing position, embarrassment, embed, embolism, embolus, engraft, engrave, enigma, entrench, establish, estate, etch, fence, fill, fill to overflowing, fill up, fine how-do-you-do, fix, flight, flock, flocks, flood, footing, force, foul, found, freight, frosting, galaxy, gate, gaum, gel, gelatin, glair, glaze, glop, glue, glut, gluten, gluttonize, goad, goo, gook, goop, gorge, gravity dam, groin, ground, gruel, gumbo, gunk, hail, halt, hang-up, hasp, heap, hell to pay, hindrance, hinge, hitch, hive, hobble, holdup, hole, honey, hook, horde, host, hot water, how-do-you-do, hurtle, hustle, hydraulic-fill dam, icing, imbroglio, impact, impasse, impediment, implant, impress, imprint, infarct, infarction, infix, ingrain, inscribe, interim, iron curtain, jab, jam-pack, jell, jelly, jetty, jog, joggle, joint, jolt, jostle, lade, lag, lagging, large amount, latch, leaping weir, legion, levee, load, loblolly, location, lock, lodge, logjam, lot, lots, maharaja, many, marmalade, mass, masses of, meringue, mess, milldam, miter, mix, moat, mob, modality, mode, molasses, mole, morass, moratorium, mortise, mound, mousse, muchness, mucilage, mucus, multiply, multitude, mystery, nail, nest, nizam, nonplus, nudge, numbers, obstacle, obstipate, obstipation, obstruct, obstruction, occlude, outroar, outshout, overburden, overcharge, overfeed, overfill, overflow with, overlade, overload, overpower, overstuff, overweight, overwhelm, pack, pad, pang, panoply, pap, paperasserie, parapet, parlous straits, pass, paste, pause, peg, perplexity, perturbation, pickle, pile drive, pin, pinch, place, plant, plight, plug, plug up, plurality, poke, porridge, portcullis, position, posture, pother, predicament, preserve, press, pretty pass, pretty pickle, pretty predicament, print, problem, prod, pudding, pullulate with, pulp, punch, puree, push, putty, puzzle, puzzlement, quagmire, quandary, quantities, quicksand, quite a few, rabbet, rabble, radiate, raja, ram, ram down, ram in, rampart, rana, rank, rattle, red tape, red-tapeism, red-tapery, reprieve, respite, retardance, retardation, riddle, rivet, roadblock, rob, rock-fill dam, root, rout, ruck, run, run against, satiate, saturate, scores, scrape, screw, sealing off, seat, seawall, semifluid, semiliquid, send, set, set in, settle, sew, shake, shoal, shoulder, shout down, shove, shut off, shut out, shut tight, shutter dam, situation, size, skewer, slough, slow-up, slowdown, slowness, snap, soak, solidify, soup, spate, spile, spot, squab, squash, squeeze, squeeze shut, squish, stamp, stanch, standing, staple, starch, state, station, status, stay, stay of execution, stench, stereotype, stew, stick, stick fast, sticky mess, sticky wicket, stifle, stitch, stone wall, stop, stop up, stoppage, stopper, stopple, strait, straits, strangle, strangulate, strangulation, stress, strike root, stuff, stuff up, suffocate, supercharge, supersaturate, surcharge, surfeit, suspension, swamp, swarm, swarm with, sweet, sweet stuff, sweetmeat, sweets, syrup, tack, take root, tamp, teem with, throng, throng with, thrust, tidy sum, tie-up, tight spot, tight squeeze, tightrope, time lag, toggle, top off, transmit, treacle, tricky spot, tutti-frutti, unassuredness, unholy mess, upset, wad, wait, wall, wedge, weight, weir, whipped cream, wicket dam, work, worlds of, zipper
The Free On-line Dictionary of Computing (18 March 2015):

JaM John and Martin. An interpreted FORTH-like graphics language by John Warnock and Martin Newell, Xerox PARC, 1978. JaM was the forerunner of both Interpress and PostScript. It is mentioned in PostScript Language reference Manual, Adobe Systems, A-W 1985.
The Free On-line Dictionary of Computing (18 March 2015):

jam A condition on a network where two nodes transmitting simultaneously detect the collision and continue to transmit for a certain time (4 to 6 bytes on Ethernet) to ensure that the collision has been detected by all nodes involved. (1994-12-12)