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Blech. These are the grossest words.


[fawr-ni-key-shuh n] /ˌfɔr nɪˈkeɪ ʃən/
voluntary sexual intercourse between two unmarried persons or two persons not married to each other.
Bible. idolatry.
Origin of fornication
1300-50; Middle English fornicacioun < Late Latin fornicātiōn- (stem of fornicātiō). See fornicate1, -ion
Related forms
[fawr-ni-kuh-tawr-ee, -tohr-ee] /ˈfɔr nɪ kəˌtɔr i, -ˌtoʊr i/ (Show IPA),
Can be confused
formication, fornication. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for fornication


voluntary sexual intercourse outside marriage
(law) voluntary sexual intercourse between two persons of the opposite sex, where one is or both are unmarried
(Bible) sexual immorality in general, esp adultery
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for fornication

c.1300, from Old French fornicacion (12c.), from Late Latin fornicationem (nominative fornicatio), noun of action from past participle stem of fornicari "fornicate," from Latin fornix (genitive fornicis) "brothel" (Juvenal, Horace), originally "arch, vaulted chamber" (Roman prostitutes commonly solicited from under the arches of certain buildings), from fornus "oven of arched or domed shape." Strictly, "voluntary sex between an unmarried man and an unmarried woman;" extended in the Bible to adultery.

Online Etymology Dictionary, © 2010 Douglas Harper
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fornication in Medicine

fornication for·ni·ca·tion (fôr'nĭ-kā'shən)
Sexual intercourse between partners who are not married to each other.

for'ni·cate' v.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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fornication in the Bible

in every form of it was sternly condemned by the Mosaic law (Lev. 21:9; 19:29; Deut. 22:20, 21, 23-29; 23:18; Ex. 22:16). (See ADULTERY.) But this word is more frequently used in a symbolical than in its ordinary sense. It frequently means a forsaking of God or a following after idols (Isa. 1:2; Jer. 2:20; Ezek. 16; Hos. 1:2; 2:1-5; Jer. 3:8,9).

Easton's 1897 Bible Dictionary
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