of, pertaining to, or characteristic of an uncle: avuncular affection.

1825–35; < Latin avuncul(us) a mother's brother, equivalent to av(us) a forefather + *-ont- + *-l(os) diminutive suffix (cf. uncle) + -ar1

avuncularity, noun
avuncularly, adverb
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World English Dictionary
avuncular (əˈvʌŋkjʊlə)
1.  of or concerned with an uncle
2.  resembling an uncle; friendly; helpful
[C19: from Latin avunculus (maternal) uncle, diminutive of avus grandfather]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1831, from L. avunculus "maternal uncle," dim. of avus (see uncle). Used humorously for "of a pawnbroker" (uncle was slang for "pawnbroker" from c.1600 through 19c.).
"My only good suit is at present under the avuncular protection." ["Fraser's Magazine," 1832]
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
In his place is a jolly, avuncular leader, seen playing with his grandchildren
  and appearing on lighter chat shows.
He is alternately avuncular and strident, cajoling and threatening.
His interest in them is supposed to be avuncular and pure.
His demeanor is commanding, with a practiced avuncular charm.
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