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• sin
  sin

  noun

  transgression of divine law.
• sīn
  sīn

  noun

  the 12th letter of the Arabic alphabet.
• Sin
  Sin

  noun

  the Akkadian god of the moon: the counterpart of the Sumerian Nanna.
• SIN
  SIN

  abbreviation

  social insurance number

sin

¹ American  

[sin] / sɪn /

noun

1. transgression of divine law.

   the sin of Adam.

   Synonyms:

   violation, trespass, misdeed

2. any act regarded as such a transgression, especially a willful or deliberate violation of some religious or moral principle.

   Synonyms:

   wickedness, wrong

3. any reprehensible or regrettable action, behavior, lapse, etc.; great fault or offense.

   It's a sin to waste time.

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verb (used without object)

sinned, sinning

1. to commit a sinful act.

   Synonyms:

   trespass, transgress

2. to offend against a principle, standard, etc.

verb (used with object)

sinned, sinning

1. to commit or perform sinfully.

   He sinned his crimes without compunction.

2. to bring, drive, etc., by sinning.

   He sinned his soul to perdition.

sin ² American  

[seen] / sin /

noun

1. the 22nd letter of the Hebrew alphabet.

2. the consonant sound represented by this letter.

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sin ³ American  

abbreviation

Trigonometry.

1. sine.

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sīn ⁴ American  

[seen] / sin /

noun

1. the 12th letter of the Arabic alphabet.

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Sin ⁵ American  

[seen] / sin /

noun

1. the Akkadian god of the moon: the counterpart of the Sumerian Nanna.

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sin ¹ British  

/ sɪn /

noun

1. theol

   1. transgression of God's known will or any principle or law regarded as embodying this

   2. the condition of estrangement from God arising from such transgression See also actual sin mortal sin original sin venial sin

2. any serious offence, as against a religious or moral principle

3. any offence against a principle or standard

4. informal (of an unmarried couple) to live together

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verb

1. theol to commit a sin

2. (usually foll by against) to commit an offence (against a person, principle, etc)

SIN ² British  

abbreviation

1. social insurance number

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sin ³ British  

/ siːn /

noun

1. a variant of shin, the 21st letter in the Hebrew alphabet (שׂ), transliterated as S See shin 2

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sin ⁴ British  

/ sɪn /

preposition

1. a Scot dialect word for since

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sin ⁵ British  

/ saɪn /

abbreviation

1. sine

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sin Scientific  

1. Abbreviation of sine

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sin Idioms  

1. see live in sin; more sinned against than sinning; multitude of sins; ugly as sin; wages of sin.

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Related Words

See crime.

Other Word Forms

• sinlike
  adjective
• sinner
  noun
• sinningly
  adverb
• sinningness
  noun
• unsinning
  adjective

Etymology

Origin of sin¹

First recorded before 900; Middle English noun sinne, sin(e), sen(ne), Old English syn(n) “moral or religious offense, misdeed”; akin to German Sünde, Old Norse synd, Latin sōns (inflectional stem sont- ) “guilty,” literally “that man being the one”; the verb is derivative of the noun; the Germanic and Latin forms all being present participle forms of the root es- “to be”; see origin at am ( def. )

Origin of sin²

First recorded in 1895–1900; from Hebrew śīn

Origin of sīn⁴

From Arabic

Explanation

You might not want to be the one at the party who takes the last piece of cake, but then again, it would be a sin to let it sit there, uneaten. A sin is a deeply regrettable action. The most common definition of sin is religious: it's an immoral act against God or divine law. Any serious offense, even if it's not religious, can be called a sin, and so can something less serious if you're talking about it in a joking way, as in, "You've got to buy those shoes — it would be an absolute sin not to." In math, sin is the abbreviation of sine, the trigonometric function.

Example Sentences

These include the Sin Nombre virus in the Western U.S. and the Andes virus in Argentina and Chile.

From MarketWatch • May 8, 2026

Just two days earlier, a magnitude 4.4 rumbled in the desert about 60 miles north of Sin City, where some people reported weak shaking.

From Los Angeles Times • May 4, 2026

However, if it is a different new world strain, for example one called Sin Nombre, which only circulates in North America, contamination in South America can be ruled out.

From Barron's • May 4, 2026

"It's A Sin was such a special show for me," said Davies, who is orginally from Swansea.

From BBC • Mar. 19, 2026

The second night he preached, his topic was The Wages of Sin.

From "Go Set a Watchman: A Novel" by Harper Lee

Related Words

• crime
• error
• evil
• fault
• guilt
• immorality
• lust
• misdeed
• offense
• shortcoming
• transgression
• violation
• wrong
• wrongdoing