Lately

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Old English lætlīce ‘slowly, tardily’ (see late, -ly2).

wiktionary

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From late +‎ -ly[15th C.]. Compare Old English lætīċe(“slowly, tardily”). [1]

etymonline

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lately (adv.)

Old English lætlice "slowly, sluggishly;" see late (adj.) + -ly (2). Meaning "within recent times, not long ago" is from late 15c., probably a new formation.