In a manner relating to or concerning ethnic groups, ethnicity, or cultural identity.
From 'ethnical' or 'ethnic' with the adverb suffix '-ly' added, allowing the adjective to modify verbs or other adjectives to describe how something relates to ethnicity.
When someone says a neighborhood is 'ethnically diverse,' they're using this adverb to describe how the population relates to different ethnic backgrounds—it's a common phrase in modern social discussion!
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