To act in the manner of an uncle; to assume or exercise an uncle's role or relationship.
Derived from Latin 'avunculus' (uncle) with the verbal suffix '-ate,' creating a back-formation that treats the avuncular relationship as an action rather than merely a description.
This is a brilliantly rare word that anthropologists love because it describes a specific family role that's culturally defined—in some societies, maternal uncles 'avunculate' in ways fathers never do!
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