| sin | (noun) an act that is regarded by theologians as a transgression of God's will | Synonyms: sinning |
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| (noun) estrangement from god | Synonyms: sinfulness, wickedness |
| (noun) the 21st letter of the Hebrew alphabet | - |
| (noun) ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle | Synonyms: sine |
| sinapism | (noun) a plaster containing powdered black mustard; applied to the skin as a counterirritant or rubefacient | Synonyms: mustard plaster |
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| sincerity | (noun) the quality of being open and truthful; not deceitful or hypocritical | - |
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| (noun) the trait of being serious | Synonyms: earnestness, serious-mindedness, seriousness |
| (noun) a quality of naturalness and simplicity | Synonyms: unassumingness |
| (noun) an earnest and sincere feeling | Synonyms: earnestness, seriousness |
| sinciput | (noun) the front part of the head or skull (including the forehead) | - |
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| sine | (noun) ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle | Synonyms: sin |
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| sinecure | (noun) an office that involves minimal duties | - |
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| (noun) a benefice to which no spiritual or pastoral duties are attached | - |
| sinew | (noun) possessing muscular strength | Synonyms: brawn, brawniness, heftiness, muscle, muscularity |
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| (noun) a cord or band of inelastic tissue connecting a muscle with its bony attachment | Synonyms: tendon |
| sinfulness | (noun) estrangement from god | Synonyms: sin, wickedness |
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| singalong | (noun) informal group singing of popular songs | Synonyms: singsong |
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| singe | (noun) a surface burn | Synonyms: scorch |
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| singer | (noun) a person who sings | Synonyms: vocaliser, vocalist, vocalizer |
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| singing | (noun) the act of singing vocal music | Synonyms: vocalizing |
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| (noun) disclosing information or giving evidence about another | Synonyms: tattle, telling |
| single | (noun) a base hit on which the batter stops safely at first base | Synonyms: bingle |
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| (noun) the smallest whole number or a numeral representing this number | Synonyms: 1, ace, I, one, unity |
| singleness | (noun) the quality of concentrating on one central objective | - |
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| (noun) without hypocrisy | Synonyms: straightforwardness |
| singles | (noun) tennis played with one person on each side | - |
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| (noun) badminton played with one person on each side | - |
| singlestick | (noun) a stick used instead of a sword for fencing | Synonyms: backsword, fencing stick |
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| singlet | (noun) a collarless men's undergarment for the upper part of the body | Synonyms: undershirt, vest |
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| singleton | (noun) the playing card that is the only card in a suit held in a bridge hand as initially dealt | - |
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| (noun) a set containing a single member | - |
| (noun) a single object (as distinguished from a pair) | - |
| singsong | (noun) informal group singing of popular songs | Synonyms: singalong |
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| (noun) a regular and monotonous rising and falling intonation | - |
| singular | (noun) the form of a word that is used to denote a singleton | Synonyms: singular form |
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| singularity | (noun) the quality of being one of a kind | Synonyms: uniqueness |
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| (noun) strangeness by virtue of being remarkable or unusual | - |
| singultus | (noun) (usually plural) the state of having reflex spasms of the diaphragm accompanied by a rapid closure of the glottis producing an audible sound; sometimes a symptom of indigestion | Synonyms: hiccough, hiccup |
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| sinistrality | (noun) preference for using the left hand | Synonyms: left-handedness |
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| sink | (noun) plumbing fixture consisting of a water basin fixed to a wall or floor and having a drainpipe | - |
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| (noun) a covered cistern; waste water and sewage flow into it | Synonyms: cesspit, cesspool, sump |
| (noun) a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof | Synonyms: sinkhole, swallow hole |
| (noun) (technology) a process that acts to absorb or remove energy or a substance from a system | - |
| sinker | (noun) a pitch that curves downward rapidly as it approaches the plate | - |
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| (noun) a weight that sinks (as to hold nets or fishing lines under water) | - |
| (noun) a small ring-shaped friedcake | Synonyms: donut, doughnut |
| sinkhole | (noun) a depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof | Synonyms: sink, swallow hole |
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| sinking | (noun) a descent as through liquid (especially through water) | - |
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| (noun) a slow fall or decline (as for lack of strength) | - |
| (noun) a feeling caused by uneasiness or apprehension | Synonyms: sinking feeling |
| sinlessness | (noun) the state of being unsullied by sin or moral wrong; lacking a knowledge of evil | Synonyms: innocence, pureness, purity, whiteness |
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| sinner | (noun) a person who sins (without repenting) | Synonyms: evildoer |
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| sinning | (noun) an act that is regarded by theologians as a transgression of God's will | Synonyms: sin |
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| sinoper | (noun) a red ocher formerly used as a pigment | Synonyms: sinopia, sinopis |
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| sinopia | (noun) a red ocher formerly used as a pigment | Synonyms: sinoper, sinopis |
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| sinopis | (noun) a red ocher formerly used as a pigment | Synonyms: sinoper, sinopia |
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| sinuosity | (noun) having bends (especially of streams and roads) | Synonyms: sinuousness |
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| sinuousness | (noun) having bends (especially of streams and roads) | Synonyms: sinuosity |
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| sinus | (noun) a wide channel containing blood; does not have the coating of an ordinary blood vessel | Synonyms: venous sinus |
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| (noun) any of various air-filled cavities especially in the bones of the skull | - |
| (noun) an abnormal passage leading from a suppurating cavity to the body surface | Synonyms: fistula |
| sinusitis | (noun) inflammation of one of the paranasal sinuses | - |
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| sinusoid | (noun) tiny endothelium-lined passages for blood in the tissue of an organ | - |
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| (noun) the curve of y=sin x | Synonyms: sine curve |