characteristic of or befitting a father; fatherly: a kind and paternal reprimand.
of or pertaining to a father.
related on the father's side: one's paternal grandfather.
derived or inherited from a father: paternal traits.

1400–50; late Middle English < Late Latin paternālis, equivalent to Latin patern(us) paternal (pater father + -nus adj. suffix) + -ālis -al1

paternally, adverb
nonpaternal, adjective
nonpaternally, adverb
unpaternal, adjective
unpaternally, adverb

1. See fatherly. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
paternal (pəˈtɜːnəl)
1.  relating to or characteristic of a father, esp in showing affection, encouragement, etc; fatherly
2.  (prenominal) related through the father: his paternal grandfather
3.  inherited or derived from the male parent
[C17: from Late Latin paternālis, from Latin pater father]

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 O.Fr. paternal "of a father" (12c.), from M.L. paternalis, from L. paternus "of a father," from pater (see father).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

paternal pa·ter·nal (pə-tûr'nəl)

  1. Relating to or characteristic of a father or fatherhood.

  2. Received or inherited from a father.

  3. Related through one's father.

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
Afterward, my father struggled to assume a properly paternal demeanor.
My paternal grandfather was a failed novelist.
Judging by photos from a polo match last year, he apparently also has inherited
  the paternal bald spot.
But sibling recognition also requires a known shared paternal connection.
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