Conveniently

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late Middle English (in the sense ‘befitting, becoming, suitable’): from Latin convenient- ‘assembling, agreeing, fitting’, from the verb convenire (see convene).

wiktionary

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convenient +‎  -ly

etymonline

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conveniently (adv.)

late 14c., "fittingly, properly, rightly," from convenient + -ly (2). Meaning "in a way that avoids difficulty" is from c. 1500.