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Both ごとに and おきに appear to mean "repeatedly at intervals".

What is the difference between these two expressions?
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2013-02-11T16:19:57.497
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2015-10-10T00:53:54.110
2013-02-17T23:12:30.957
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question
grammar usage meaning
what is the difference between ごとに and おきに?
１日おきに = ２日ごとに (every other day, every second day)  
●○●○●○●...  
  
２日おきに = ３日ごとに (every three days, every third day)  
●○○●○○●○○●...  
  
ごとに(毎に) [ごとに
@weblio](http://ejje.weblio.jp/content/%E3%81%94%E3%81%A8%E3%81%AB)  
おきに(置きに) [2日置きに
@weblio](http://ejje.weblio.jp/content/2%E6%97%A5%E7%BD%AE%E3%81%8D%E3%81%AB)

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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2013-02-11T22:55:20.507
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2015-10-10T00:53:54.110
2015-10-10T00:53:54.110
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answer