of or befitting a brother or brothers; brotherly.
of or being a society of men associated in brotherly union, as for mutual aid or benefit: a fraternal order; a fraternal association.

1375–1425; late Middle English < Latin frātern(us) fraternal (derivative of frāter brother) + -al1

fraternalism, noun
fraternally, adverb
interfraternal, adjective
interfraternally, adverb
nonfraternal, adjective
nonfraternally, adverb
prefraternal, adjective
prefraternally, adverb
quasi-fraternal, adjective
quasi-fraternally, adverb
unfraternal, adjective
unfraternally, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
fraternal (frəˈtɜːnəl)
1.  of or suitable to a brother; brotherly
2.  of or relating to a fraternity
3.  Compare identical designating either or both of a pair of twins of the same or opposite sex that developed from two separate fertilized ova
[C15: from Latin frāternus, from frāter brother]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

early 15c., from M.L. fraternalis, from L. fraternus brotherly (see fraternity).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fraternal fra·ter·nal (frə-tûr'nəl)

  1. Of or relating to brothers.

  2. Of, relating to, or being a twin developed from two separately fertilized ova; dizygotic.

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
In public, he is loyalty and fraternal pride incarnate.
Lobstermen form a fraternal order of their own, and lobster wars between rival
  communities of fishermen often erupt.
Then came social changes to dull the appeal of fraternal organizations.
If they did they would no longer be fraternal organizations.
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