exogamy

[ek-sog-uh-mee]
noun
1.
marriage outside a specific tribe or similar social unit. Compare endogamy.
2.
Biology. the union of gametes of unrelated parents.

Origin:
1860–65; exo- + -gamy

exogamous [ek-sog-uh-muhs] , exogamic [ek-suh-gam-ik] , adjective
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World English Dictionary
exogamy (ɛkˈsɒɡəmɪ)
 
n
1.  sociol, anthropol Compare endogamy the custom or an act of marrying a person belonging to another tribe, clan, or similar social unit
2.  biology fusion of gametes from parents that are not closely related
 
exogamous
 
adj
 
exogamic
 
adj

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Etymonline
Word Origin & History

exogamy
1865, from Gk. exo "outside" + gamos "marriage." Related: Exogamous.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

exogamy ex·og·a·my (ěk-sŏg'ə-mē)
n.
Sexual reproduction by means of conjugation of two gametes of different ancestry, as in certain protozoan species.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
The need for exogamy-the rule of marrying outside the group-could be satisfied at these meetings.
In some cases the stratagem seems necessary to maintain a healthy degree of exogamy, or outbreeding.
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