Evenly

wiktionary

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From Middle English evenly, evenliche, from Old English efenlīċe(“evenly, alike, equally”), equivalent to even +‎ -ly.

etymonline

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evenly (adv.)

Old English efenlice "evenly, equally;" see even (adj.) + -ly (2). Meaning "so as to produce uniformity of texture is early 15c.; that of "without surface irregularities, smoothly" is from 1630s.