In an average manner; moderately or to a middling degree; without excellence or distinction.
From average (from Medieval Latin averagium, a toll or charge) plus -ly (forming adverbs). The word emerged in English around the 15th-16th century as commerce created the mathematical concept of averaging.
When people say someone is 'averagely talented,' they're actually being mathematical without realizing it—the adverb form shows how the medieval concept of calculating 'average' charges evolved into how we describe people who are just... okay, solidly in the middle.
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