| sigeh | (noun) a Shiite tradition of temporary marriage permitted in Iran that allows a couple to specify the terms of their relationship; can last from a few minutes to 99 years | - |
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| sigh | (noun) an utterance made by exhaling audibly | Synonyms: suspiration |
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| (noun) a sound like a person sighing | - |
| (verb) heave or utter a sigh; breathe deeply and heavily | Synonyms: suspire |
| (verb) utter with a sigh | - |
| sight | (noun) the act of looking or seeing or observing | Synonyms: survey, view |
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| (noun) the ability to see; the visual faculty | Synonyms: vision, visual modality, visual sense |
| (noun) an instance of visual perception | - |
| (noun) the range of vision | Synonyms: ken |
| (noun) a range of mental vision | - |
| (noun) a place of interest, especially to visitors | - |
| (noun) anything that is seen | - |
| (noun) (often followed by `of') a large number or amount or extent | Synonyms: batch, deal, flock, good deal, great deal, hatful, heap, lot, mass, mess, mickle, mint, mountain, muckle, passel, peck, pile, plenty, pot, quite a little, raft, slew, spate, stack, tidy sum, wad |
| (verb) catch sight of; to perceive with the eyes | Synonyms: spy |
| (verb) take aim by looking through the sights of a gun (or other device) | - |
| sighted | (adjective) able to see | - |
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| sightedness | (noun) normal use of the faculty of vision | Synonyms: eyesight, seeing |
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| sighting | (noun) the act of observing | - |
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| sightless | (adjective) lacking sight | Synonyms: eyeless, unseeing |
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| sightlessness | (noun) the state of being blind or lacking sight | Synonyms: blindness, cecity |
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| sightly | (adjective) very pleasing to the eye | Synonyms: bonnie, bonny, comely, fair |
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| sightread | (verb) perform music from a score without having seen the score before | Synonyms: sight-read |
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| sightreader | (noun) a performer who reads without preparation or prior acquaintance (as in music) | - |
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| sights | (noun) an optical instrument for aiding the eye in aiming, as on a firearm or surveying instrument | - |
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| sightsee | (verb) visit famous or interesting sights | - |
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| sightseeing | (noun) going about to look at places of interest | Synonyms: rubber-necking |
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| sightseer | (noun) a tourist who is visiting sights of interest | Synonyms: excursionist, rubberneck, tripper |
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| sightsing | (verb) sing from a score without having seen it before | Synonyms: sight-sing |
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| siglum | (noun) a sign, abbreviation, letter, or character standing for words in ancient manuscripts or on coins or medals. | - |
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| sigma | (noun) the 18th letter of the Greek alphabet | - |
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| sigmoid | (adjective) of or relating to the sigmoid flexure in the large intestine | Synonyms: sigmoidal |
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| (adjective) curved in two directions (like the letter S) | - |
| sigmoidal | (adjective) of or relating to the sigmoid flexure in the large intestine | Synonyms: sigmoid |
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| sigmoidectomy | (noun) surgical removal of part or all of the sigmoid colon (usually to remove a malignant tumor) | - |
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| sigmoidoscope | (noun) an endoscope (a flexible fiberoptic probe) for examining the sigmoid colon | Synonyms: flexible sigmoidoscope |
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| sigmoidoscopy | (noun) visual examination (with a sigmoidoscope) of the lower third of the colon in a search for polyps | Synonyms: flexible sigmoidoscopy |
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| sign | (adjective) used of the language of the deaf | Synonyms: gestural, sign-language, signed |
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| (noun) structure displaying a board on which advertisements can be posted | Synonyms: signboard |
| (noun) a public display of a message | - |
| (noun) a gesture that is part of a sign language | - |
| (noun) any nonverbal action or gesture that encodes a message | Synonyms: signal, signaling, signalling |
| (noun) a character indicating a relation between quantities | - |
| (noun) a perceptible indication of something not immediately apparent (as a visible clue that something has happened) | Synonyms: mark |
| (noun) a fundamental linguistic unit linking a signifier to that which is signified | - |
| (noun) an event that is experienced as indicating important things to come | Synonyms: augury, foretoken, preindication |
| (noun) (astrology) one of 12 equal areas into which the zodiac is divided | Synonyms: house, mansion, planetary house, sign of the zodiac, star sign |
| (noun) having an indicated pole (as the distinction between positive and negative electric charges) | Synonyms: polarity |
| (noun) (medicine) any objective evidence of the presence of a disorder or disease | - |
| (verb) be engaged by a written agreement | - |
| (verb) communicate silently and non-verbally by signals or signs | Synonyms: signal, signalise, signalize |
| (verb) mark with one's signature; write one's name (on) | Synonyms: subscribe |
| (verb) make the sign of the cross over someone in order to call on God for protection; consecrate | Synonyms: bless |
| (verb) communicate in sign language | - |
| (verb) place signs, as along a road | - |
| (verb) approve and express assent, responsibility, or obligation | Synonyms: ratify |
| (verb) engage by written agreement | Synonyms: contract, sign on, sign up |
| signage | (noun) signs collectively (especially commercial signs or posters) | - |
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| signal | (adjective) notably out of the ordinary | - |
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| (noun) any nonverbal action or gesture that encodes a message | Synonyms: sign, signaling, signalling |
| (noun) any incitement to action | - |
| (noun) an electric quantity (voltage or current or field strength) whose modulation represents coded information about the source from which it comes | - |
| (verb) communicate silently and non-verbally by signals or signs | Synonyms: sign, signalise, signalize |
| (verb) be a signal for or a symptom of | Synonyms: bespeak, betoken, indicate, point |
| signaler | (noun) someone who communicates by signals | Synonyms: signaller |
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| signaling | (noun) any nonverbal action or gesture that encodes a message | Synonyms: sign, signal, signalling |
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| signalisation | (noun) a conspicuous indication | Synonyms: signalization |
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| signalise | (verb) make conspicuous or noteworthy | Synonyms: distinguish, signalize |
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| (verb) communicate silently and non-verbally by signals or signs | Synonyms: sign, signal, signalize |
| (verb) point out carefully and clearly | Synonyms: call attention, point out, signalize |
| (verb) provide with traffic signals | Synonyms: signalize |
| signalization | (noun) a conspicuous indication | Synonyms: signalisation |
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| signalize | (verb) make conspicuous or noteworthy | Synonyms: distinguish, signalise |
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| (verb) communicate silently and non-verbally by signals or signs | Synonyms: sign, signal, signalise |
| (verb) point out carefully and clearly | Synonyms: call attention, point out, signalise |
| (verb) provide with traffic signals | Synonyms: signalise |
| signaller | (noun) someone who communicates by signals | Synonyms: signaler |
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| signalling | (noun) any nonverbal action or gesture that encodes a message | Synonyms: sign, signal, signaling |
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| signally | (adverb) in a signal manner | Synonyms: remarkably, unmistakably |
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| (adverb) as a signal | - |
| signalman | (noun) a railroad employee in charge of signals and point in a railroad yard | - |
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| signatory | (noun) someone who signs and is bound by a document | Synonyms: signer |
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| signature | (noun) a distinguishing style | Synonyms: touch |
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| (noun) your name written in your own handwriting | - |
| (noun) a sheet with several pages printed on it; it folds to page size and is bound with other signatures to form a book | - |
| (noun) the sharps or flats that follow the clef and indicate the key | Synonyms: key signature |
| (noun) a melody used to identify a performer or a dance band or radio/tv program | Synonyms: signature tune, theme song |
| signboard | (noun) structure displaying a board on which advertisements can be posted | Synonyms: sign |
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| signed | (adjective) having a handwritten signature | - |
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| (adjective) used of the language of the deaf | Synonyms: gestural, sign-language, sign |
| signer | (noun) someone who signs and is bound by a document | Synonyms: signatory |
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| (noun) someone who can use sign language to communicate | - |
| signet | (noun) a seal (especially one used to mark documents officially) | - |
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| significance | (noun) the quality of being significant | - |
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| (noun) a meaning that is not expressly stated but can be inferred | Synonyms: implication, import |
| (noun) the message that is intended or expressed or signified | Synonyms: import, meaning, signification |
| significant | (adjective) important in effect or meaning | Synonyms: important |
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| (adjective) too closely correlated to be attributed to chance and therefore indicating a systematic relation | - |
| (adjective) of considerable importance, size, or worth | Synonyms: substantial |
| (adjective) rich in significance or implication | Synonyms: meaning, pregnant |
| significantly | (adverb) in an important way or to an important degree | Synonyms: importantly |
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| (adverb) in a significant manner | - |
| (adverb) in a statistically significant way | - |
| signification | (noun) the message that is intended or expressed or signified | Synonyms: import, meaning, significance |
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| significative | (adjective) (usually followed by `of') pointing out or revealing clearly | Synonyms: indicative, indicatory, revelatory, suggestive |
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| signified | (noun) the meaning of a word or expression; the way in which a word or expression or situation can be interpreted | Synonyms: sense |
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| signifier | (noun) the phonological or orthographic sound or appearance of a word that can be used to describe or identify something | Synonyms: descriptor, form, word form |
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| signify | (verb) convey or express a meaning | - |
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| (verb) make known with a word or signal | - |
| (verb) denote or connote | Synonyms: intend, mean, stand for |
| signing | (noun) language expressed by visible hand gestures | Synonyms: sign language |
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| signior | (noun) used as an Italian courtesy title; can be prefixed to the name or used separately | Synonyms: signor |
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| signor | (noun) used as an Italian courtesy title; can be prefixed to the name or used separately | Synonyms: signior |
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| signora | (noun) an Italian title of address equivalent to Mrs. when used before a name | - |
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| signore | (noun) an Italian title of respect for a man; equivalent to the English `sir'; used separately (not prefixed to his name) | - |
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| signorina | (noun) an Italian courtesy title for an unmarried woman; equivalent to `Miss', it is either used alone or before a name | - |
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| signory | (noun) the estate of a seigneur | Synonyms: seigneury, seigniory |
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| signpost | (noun) a post bearing a sign that gives directions or shows the way | Synonyms: guidepost |
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| (verb) mark with a signpost, as of a path | - |