In a manner that represents the most typical or original example of something.
From archetype (Greek 'archi-' first + 'typos' impression/pattern) + '-ally.' Describes actions or qualities done in the way an original prototype would do them.
When someone acts 'archetypally British' or 'archetypally American,' they're embodying all the stereotypical traits so perfectly that it's like they're the poster-child version of that identity!
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