a close social relationship between a maternal uncle and his nephew.
Origin of avunculate
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
the custom in some societies of assigning rights and duties to a maternal uncle concerning his sister's son
of, relating to, or governed by this custom
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