Sin (s?n)n. Mythology The Babylonian god of the moon.[Akkadian Sîn.]sin 1 (s?n)n.1. A transgression of a religious or moral law, especially when deliberate.2. Theology a. Deliberate disobedience to the known will of God.b. A condition of estrangement from God resulting from such disobedience.3. Something regarded as being shameful, deplorable, or utterly wrong.intr.v. sinned, sin·ning, sins To violate a religious or moral law.Idioms: live in sin To cohabit in a sexual relationship without being married. as sin Completely or extremely: He is guilty as sin.[Middle English sinne, from Old English synn; see es- in Indo-European roots.]sin 2 (s?n, s?n)n. One of the two forms of the 21st letter of the Hebrew alphabet, distinguished from the letter shin by having a dot above the left side of the letter. See Table at alphabet.[Hebrew ?în, modeled on ?în, shin (the following letter).]sin 3abbr. sineAmerican Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.sin (s?n) n1. (Theology) theol a. transgression of God’s known will or any principle or law regarded as embodying thisb. the condition of estrangement from God arising from such transgression. See also actual sin, mortal sin, original sin, venial sin2. any serious offence, as against a religious or moral principle3. any offence against a principle or standard4. live in sin informal (of an unmarried couple) to live togethervb (intr) , sins, sinning or sinned5. (Theology) theol to commit a sin6. (usually foll by against) to commit an offence (against a person, principle, etc)[Old English synn; related to Old Norse synth, Old High German suntea sin, Latin sons guilty] ?sinner nsin (s?n) prep, conj, adv a Scot dialect word for sincesin (si?n) n (Letters of the Alphabet (Foreign)) a variant of shin, the 21st letter in the Hebrew alphabet (??), transliterated as S. See shin2sin (sa?n) mathsabbreviation for (Mathematics) sineSIN or S.I.N.(in Canada) abbreviation for (Social Welfare) social insurance numberCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014sin1 (s?n) n., v. sinned, sin?ning. n. 1. transgression of divine law. 2. any act regarded as such a transgression, esp. a willful violation of some religious or moral principle. 3. any reprehensible action; serious fault or offense. v.i. 4. to commit a sinful act. 5. to offend against a principle, standard, etc. [before 900; Old English syn(n) offense, akin to Old High German sunt(e)a, Old Norse synd] syn: See crime. sin2 (sin, s?n) n. the 22nd letter of the Hebrew alphabet. [1895?1900;