Connected or associated with an organization, group, or person in an official capacity.
From Latin 'affiliatus' (adopted as a son), from 'ad-' (to) + 'filius' (son). The sense evolved from literal adoption to any formal association or membership with a group.
The word literally means 'adopted as a son'—which shows how formal organizations borrowed family language to describe membership, as if joining a group made you part of their family!
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