
The avunculate (sometimes called avunculism or avuncularism) is a feature of some societies whereby men have a special role in relation to their sisters` children. ==Definition== The term avunculate comes from the Latin kinship term avunculus (`mother`s brother`, in opposition to the brother of the father). In societies where maternal filiatio...
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http://en.wikipedia.org/wiki/Avunculate

special relationship between a man and his sister`s children, particularly her sons, which prevails in many societies, notably those characterized ...
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http://www.britannica.com/eb/a-z/a/131

avunculate 1. In some patrilineal societies, to have a special relationship similar to that of father and son that exists between a man and his sister's sons or his nephews. 2. The relationship between a man and his sister's children, generally her sons. With some tribal people, avunculate refers to a special relationship between a man and his mat...
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http://www.wordinfo.info/words/index/info/view_unit/3385/

a close social relationship between a maternal uncle and his nephew.
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https://www.infoplease.com/dictionary/avunculate
No exact match found.