1.  signal(n = noun.communication) sign, signaling - any nonverbal action or gesture that encodes a message; "signals from the boat suddenly stopped"
is a kind of communication
has particulars: recording, number, phone number, telephone number, start, starting signal, storm signal, beam, radio beam, ticktack, time signal, dog-ear, animal communication, alarm, alarum, alert, warning signal, distress call, distress signal, all clear, bugle call, curfew, retreat, drumbeat, radiotelegraphic signal, telegraphic signal, whistle, whistling, high sign, symbol, visual signal, indicator, electronic signal, radio beacon, input, input signal, output, output signal
Derived forms verb signal₂, verb signal₁, verb signalize₄, verb signalize₃, verb signalize₂, verb signalize₁

2.  signal(n = noun.motive) - any incitement to action; "he awaited the signal to start"; "the victory was a signal for wild celebration"
is a kind of incitation, incitement, provocation

3.  signal(n = noun.phenomenon) - an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes;
is a kind of electrical energy, electricity
has particulars: interrupt

1.  signal(v = verb.communication) sign, signalise, signalize - communicate silently and non-verbally by signals or signs; "He signed his disapproval with a dismissive hand gesture"; "The diner signaled the waiters to bring the menu"
is one way to communicate, intercommunicate
Derived forms noun signal₁, noun signaler₁, noun signaling₁, noun signaller₁
Sample sentences: They signal them the information; They signal the information to them

2.  signal(v = verb.communication) bespeak, betoken, indicate, point - be a signal for or a symptom of; "These symptoms indicate a serious illness"; "Her behavior points to a severe neurosis"; "The economic indicators signal that the euro is undervalued"
is one way to tell
Derived form noun signal₁
Sample sentences: Something ----s something

   signal(s = adj.all) - notably out of the ordinary; "the year saw one signal triumph for the Labour party"

1.  A sign made for the purpose of giving notice to a person of some occurence, command, or danger; also, a sign, event, or watchword, which has been agreed upon as the occasion of concerted action. [1913 Webster]
"All obeyed
The wonted signal and superior voice
Of this great potentate." [1913 Webster]

2.  A token; an indication; a foreshadowing; a sign. [1913 Webster]
"The weary sun . . .
Gives signal of a goodly day to-morrow." [1913 Webster]
"There was not the least signal of the calamity to be seen." [1913 Webster]

1.  Noticeable; distinguished from what is ordinary; eminent; remarkable; memorable; as, a signal exploit; a signal service; a signal act of benevolence. [1913 Webster]
"As signal now in low, dejected state
As erst in highest, behold him where he lies." [1913 Webster]

2.  Of or pertaining to signals, or the use of signals in conveying information; as, a signal flag or officer. [1913 Webster]

1.  To communicate by signals; as, to signal orders. [1913 Webster]

2.  To notify by a signals; to make a signal or signals to; as, to signal a fleet to anchor. M. Arnold. [1913 Webster]

signal, n. & v.
--n.
1 a a usu. prearranged sign conveying information, guidance, etc. esp. at a distance (waved as a signal to begin). b a message made up of such signs (signals made with flags).
2 an immediate occasion or cause of movement, action, etc. (the uprising was a signal for repression).
3 Electr. a an electrical impulse or impulses or radio waves transmitted as a signal. b a sequence of these.
4 a light, semaphore, etc., on a railway giving instructions or warnings to train-drivers etc.
5 Bridge a prearranged mode of bidding or play to convey information to one's partner.
--v. (signalled, signalling; US signaled, signaling)
1 intr. make signals.
2 tr. a (often foll. by to + infin.) make signals to; direct. b transmit (an order, information, etc.) by signal; announce (signalled her agreement; signalled that the town had been taken).

Idiom:
signal-book a list of signals arranged for sending esp. naval and military messages. signal-box Brit. a building beside a railway track from which signals are controlled. signal of distress esp. Naut. an appeal for help, esp. from a ship by firing guns. signal-tower US = signal-box.

Derivative:
signaller n.

signal, adj. remarkably good or bad; noteworthy (a signal victory).

Derivative:
signally adv.

Etymology:
F signal{eacute} f. It. past part. segnalato distinguished f. segnale SIGNAL(1)

N  importance, consequence, moment, prominence, consideration, mark, materialness, import, significance, concern, emphasis, interest, greatness, superiority, notability, weight, value, usefulness, gravity, seriousness, solemnity, no joke, no laughing matter, pressure, urgency, stress, matter of life and death, memorabilia, notabilia, great doings, red-letter day, great thing, great point, main chance, the be all and the end all, cardinal point, substance, gist, sum and substance, gravamen, head and front, important part, principal part, prominent part, essential part, half the battle, sine qua non, breath of one's nostrils, cream, salt, core, kernel, heart, nucleus, keynote, keystone, corner stone, trump card, salient points, top sawyer, first fiddle, prima donna, chief, triton among the minnows, 'it', important, of importance, momentous, material, to the point, not to be overlooked, not to be despised, not to be sneezed at, egregious, weighty, of note, notable, prominent, salient, signal, memorable, remarkable, unforgettable, worthy of remark, worthy of notice, never to be forgotten, stirring, eventful, grave, serious, earnest, noble, grand, solemn, impressive, commanding, imposing, urgent, pressing, critical, instant, paramount, essential, vital, all-absorbing, radical, cardinal, chief, main, prime, primary, principal, leading, capital, foremost, overruling, of vital importance in the front rank, first-rate, superior, considerable, marked, rare, significant, telling, trenchant, emphatic, pregnant, tanti, materially, in the main, above all, kat' exochin, par excellence, to crown all, to beat all, expende Hannibalem!.

N  greatness, magnitude, size, multitude, immensity, enormity, infinity, might, strength, intensity, fullness, importance, great quantity, quantity, deal, power, sight, pot, volume, world, mass, heap, stock, peck, bushel, load, cargo, cartload, wagonload, shipload, flood, spring tide, abundance, principal part, chief part, main part, greater part, major part, best part, essential part, bulk, mass, great, greater, large, considerable, fair, above par, big, huge, Herculean, cyclopean, ample, abundant, full, intense, strong, sound, passing, heavy, plenary, deep, high, signal, at its height, in the zenith, world-wide, widespread, far-famed, extensive, wholesale, many, goodly, noble, precious, mighty, sad, grave, heavy, serious, far gone, arrant, downright, utter, uttermost, crass, gross, arch, profound, intense, consummate, rank, uninitiated, red-hot, desperate, glaring, flagrant, stark staring, thorough-paced, thoroughgoing, roaring, thumping, extraordinary, important, unsurpassed, complete, august, grand, dignified, sublime, majestic, vast, immense, enormous, extreme, inordinate, excessive, extravagant, exorbitant, outrageous, preposterous, unconscionable, swinging, monstrous, overgrown, towering, stupendous, prodigious, astonishing, incredible, marvelous, unlimited, unapproachable, unutterable, indescribable, ineffable, unspeakable, inexpressible, beyond expression, fabulous, undiminished, unabated, unreduced, unrestricted, absolute, positive, stark, decided, unequivocal, essential, perfect, finished, remarkable, of mark, marked, pointed, veriest, noteworthy, renowned, truly, decidedly, unequivocally, purely, absolutely, seriously, essentially, fundamentally, radically, downright, in all conscience, for the most part, in the main, entirely, abundantly, widely, far and wide, greatly, much, muckle, well, indeed, very, very much, a deal, no end of, most, not a little, pretty, pretty well, enough, in a great measure, richly, to a large extent, to a great extent, to a gigantic extent, on a large scale, so, never so, ever so, ever so dole, scrap, shred, tag, splinter, rag, much, by wholesale, mighty, powerfully, with a witness, ultra, in the extreme, extremely, exceedingly, intensely, exquisitely, acutely, indefinitely, immeasurably, beyond compare, beyond comparison, beyond measure, beyond all bounds, incalculably, infinitely, preeminently, superlatively, immoderately, monstrously, preposterously, inordinately, exorbitantly, excessively, enormously, out of all proportion, with a vengeance, particularly, remarkably, singularly, curiously, uncommonly, unusually, peculiarly, notably, signally, strikingly, pointedly, mainly, chiefly, famously, egregiously, prominently, glaringly, emphatically, kat exochin, strangely, wonderfully, amazingly, surprisingly, astonishingly, incredibly, marvelously, awfully, stupendously, peculiarly, furiously, severely, desperately, tremendously, extravagantly, confoundedly, deucedly, devilishly, with a vengeance, a outrance, a toute outrance, painfully, sadly, grossly, sorely, bitterly, piteously, grievously, miserably, cruelly, woefully, lamentably, shockingly, frightfully, dreadfully, fearfully, terribly, horribly, a maximis ad minima, greatness knows itself, mightiest powers by deepest calms are fed, minimum decet libere cui multum licet, some are born great, some achieve greatness, and some have greatness thrust upon them.

N  eventuality, event, occurrence, incident, affair, matter, thing, episode, happening, proceeding, contingency, juncture, experience, fact, matter of fact, naked fact, bare facts, just the facts, phenomenon, advent, business, concern, transaction, dealing, proceeding, circumstance, particular, casualty, accident, adventure, passage, crisis, pass, emergency, contingency, consequence, opportunity (occasion), the world, life, things, doings, affairs in general, things in general, affairs in general, the times, state of affairs, order of the day, course of things, tide of things, stream of things, current of things, run of things, march of things, course of events, ups and downs of life, vicissitudes of life, chapter of accidents, situation, happening, going on, doing, current, in the wind, in the air, afloat, on foot, afoot, on the tapis, at issue, in question, incidental, eventful, stirring, bustling, full of incident, memorable, momentous, signal, eventually, in the event of, in case, just in case, in the course of things, as things, times go, as the world goes, wags, as the tree falls, cat jumps, as it may turn out, happen, that's the way the ball bounces, that's the way the cookie crumbles, you never know what may turn up, you never know what the future will bring, the plot thickens, breasts the blows of circumstance, so runs round of life from hour to hour, sprinkled along the waste of years.

N  indication, symbolism, symbolization, semiology, semiotics, semeiology, semeiotics, Zeitgeist, characteristic, diagnostic, lineament, feature, trait, fingerprint, voiceprint, footprint, noseprint, cloven hoof, footfall, recognition (memory), diagnostic, divining rod, detector, sign, symbol, index, indice, indicator, point, pointer, exponent, note, token, symptom, dollar sign, dollar mark, type, figure, emblem, cipher, device, representation, epigraph, motto, posy, gesture, gesticulation, pantomime, wink, glance, leer, nod, shrug, beck, touch, nudge, dactylology, dactylonomy, freemasonry, telegraphy, chirology, byplay, dumb show, cue, hint, clue, clew, key, scent, signal, signal post, rocket, blue light, watch fire, watch tower, telegraph, semaphore, flagstaff, cresset, fiery cross, calumet, heliograph, guidon, headlight, mark, scratch, line, stroke, dash, score, stripe, streak, tick, dot, point, notch, nick, print, imprint, impress, impression, keyboard symbols, printing symbols, red letter, italics, sublineation, underlining, bold font, jotting, note, annotation, reference, blaze, cedilla, guillemets, hachure, quotation marks, ", double quotes, " ", parentheses, "( )", brackets, "", braces, "", left arrow, "<", right arrow, ">", forward slash, "/", backward slash, "\", exclamation point, "!", commercial at, "@", pound sign, "#", percent sign, "%", carat, "", ampersand, "&", asterisk, "*", hyphen, "-", dash, "-", "_", em dash, "--", plus sign, "+", equals sign, "=", question mark, "?", period, ", ", semicolon, ", ", colon, ":", comma, ", ", apostrophe, "'", single quote, "'", tilde, "~", badge, criterion, countercheck, countermark, countersign, counterfoil, duplicate, tally, label, ticket, billet, letter, counter, check, chip, chop, dib, totem, tessera, card, bill, witness, voucher, stamp, cacher, trade mark, Hall mark, signature, mark, autograph, autography, attestation, hand, hand writing, sign manual, cipher, seal, sigil, signet, hand and seal, paraph, brand, superscription, indorsement, endorsement, password, watchword, catchword, security card, pass, passkey, credentials, open sesame, timbrology, mot de passe, mot du guet, pass-parole, shibboleth, title, heading, docket, address card, visiting card, carte de visite, insignia, banner, banneret, bannerol, bandrol, flag, colors, streamer, standard, eagle, labarum, oriflamb, oriflamme, figurehead, ensign, pennon, pennant, pendant, burgee, blue Peter, jack, ancient, gonfalon, union jack, banderole, old glory, quarantine flag, vexillum, yellow-flag, yellow jack, tricolor, stars and stripes, bunting, heraldry, crest, coat of arms, arms, armorial bearings, hatchment, escutcheon, scutcheon, shield, supporters, livery, uniform, cockade, epaulet, chevron, garland, love knot, favor, beacon, cairn, post, staff, flagstaff, hand, pointer, vane, cock, weathercock, guidepost, handpost, fingerpost, directing post, signpost, pillars of Hercules, pharos, bale-fire, beacon-fire, l'etoile du Nord, landmark, seamark, lighthouse, balize, polestar, loadstar, lodestar, cynosure, guide, address, direction, name, sign, signboard, warning, omen, prefigurement, trace, record, warning &c, alarm, scepter, trophy, gauge, milestone, milepost, brand, fool's cap, check, telltale, test, mileage ticket, milliary, notification, advertisement, word of command, call, bugle call, trumpet call, bell, alarum, cry, battle cry, rallying cry, angelus, reveille, sacring bell, sanctus bell, exposition &c (explanation), proof, pattern, indicating, indicative, indicatory, denotative, connotative, diacritical, representative, typical, symbolic, pantomimic, pathognomonic, symptomatic, characteristic, demonstrative, diagnostic, exponential, emblematic, armorial, individual, known by, recognizable by, indicated, pointed, marked, denotable, indelible, in token of, symbolically, in dumb show, ecce signum, ex ungue leonem, ex pede Herculem, vide ut supra, vultus ariete fortior.

background signal, block signal, distress signal, electronic signal, fog signal, frost signal, input signal, nautical signal flag, output signal, radio signal, radiotelegraphic signal, signal box, signal caller, signal detection, signal fire, signal flag, signal level, signal light, starting signal, storm signal, telegraphic signal, time signal, traffic signal, turn signal, visual signal, wake-up signal, warning signal, weather signal, wind signal