In a manner relating to or involving features; with respect to distinctive characteristics.
From feature (from Old French 'faiture' meaning 'form' or 'appearance') plus the suffix -ally, forming adverbs that indicate manner or relationship to a quality.
This word is rarely used in modern English, but it represents how we can turn almost any noun into an adverb by adding -ally—a creative feature of English that lets speakers coin new adverbs on the fly.
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