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Is 随時{ずいじ} used to express anytime like いつでも?

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Exactly.

「随時」 looks and sounds more formal and/or academic than 「いつでも」, which is quite informal.

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    This answer is wrong. the terms have different nuances and it's not just a formality issue. – paullb Mar 27 '17 at 14:05
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The words are actually quite different in their nuances: (and consequently not interchangeable)

  • 随時 - as required (e.g. 随時更新します - I will update as required (as things change))
  • いつでも - at any time (e.g. いつでも来てください - Come whenever you like)
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    +1. 隋時 implies that there are many small requests/tasks which are served as they came. You cannot use 随時 for a one-time event. – naruto Mar 27 '17 at 1:36
  • I believe 随時 has two senses: 1) at any time 2) as needed. My question was about the first sense, therefore l'électeur(japanese.stackexchange.com/users/4032/l%c3%a9lecteur) answer is the most appropriate. – user1602 Mar 28 '17 at 18:21
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    @user1602 If you already knew the answer then why did you ask this question? 随時 does not mean at any time and cannot be used to reference a one time event as Naruto correctly pointed out. The consensus is clear that this answer is correct. – paullb Mar 28 '17 at 23:59
  • I was skeptical about the answer, and wanted a native Japanese speaker to confirm the JMDict translation. Obviously you do not trust l'électeur, so to confirm his answer I had to struggle with my limited Japanese to understand Goo 辞書 dictionary.goo.ne.jp/srch/all/%E9%9A%8F%E6%99%82/m1u and it looks like one of the senses is 好きな時にいつでも, which very close to "anytime", and by the way, anytime does not imply one time - I don't know where this came from. – user1602 Mar 29 '17 at 1:48
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    L'electeur provides many great answers, but on this particular occasion he is incorrect. I checked your link at it says "適宜" (as appropriate) and 定期的でないこと (irregularly). These terms are not interchangeable and they have different nuances. As I said, the consensus is clearly on this answer yet you seem very invested in the other answer. – paullb Mar 29 '17 at 2:22

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