Both ごとに and おきに appear to mean "repeatedly at intervals".
What is the difference between these two expressions?
Answer
１日おきに = ２日ごとに (every other day, every second day)
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２日おきに = ３日ごとに (every three days, every third day)
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ごとに(毎に) ごとに @weblio
おきに(置きに) 2日置きに @weblio
おき(置き) came from the verb 置く(leave). I think it's like "an interval (between the actions)" here. cf. 「[間隔]{かんかく}を[置]{お}く」
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