Equally

google

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late Middle English: from Latin aequalis, from aequus ‘even, level, equal’.

wiktionary

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equal +‎  -ly

etymonline

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equally (adv.)

late 14c., "in equal shares," from equal (adj.) + -ly (2). Meaning "impartially" is from 1520s; that of "in an equal manner, uniformly" is from 1660s.