In a way that is typical, distinctive, or representative of someone or something's essential nature; in a manner showing characteristic qualities.
From 'characteristic' plus the adverb suffix '-ly' meaning in the manner of, creating an adverb that modifies verbs to show typical behavior or qualities.
When you say 'characteristically, she was late'—you're saying her lateness is just normal for her, part of her nature. The word turns personality traits into predictable patterns.
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