avunculatePronunciation: /əˈvʌŋkjʊlət/Definition of avunculate noun (the avunculate) Anthropology the special relationship in some societies between a man and his sister’s son: kinship relations such as the avunculateOrigin: early 20th century: from Latin avunculus 'maternal uncle' + -ate2avunculate in other Oxford dictionaries Definition of avunculate in the US English dictionary