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JLPT N4 · Time & sequence

おきに (oki ni)

~おきに — “every ~ / at intervals of ~”

In short · Attached to a number or time expression, it shows something repeats at regular intervals: 十分おきに, 一日おきに.
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Pattern

  • 数量・時間+おきに 十分おきに / 四時間おきに / 一日おきに

Meaning

一日おきに literally means “leaving one day in between”, i.e. every other day (once every two days). With hours and minutes, 四時間おきに is used much like “every four hours”.

How it is used

Common for timetables, medicine directions and exercise habits. Be careful: it is not the same as 毎日 (every day).

Examples

  • バスは十分(じゅっぷん)おきに来(き)ます。

    Basu wa juppun oki ni kimasu.

    The bus comes every ten minutes.

  • この薬(くすり)は四時間(よじかん)おきに飲(の)む。

    Kono kusuri wa yojikan oki ni nomu.

    Take this medicine every four hours.

  • 一日(いちにち)おきにプールで泳(およ)ぐ。

    Ichinichi oki ni pūru de oyogu.

    I swim in the pool every other day.

Common mistakes

  • 一日おき is not “daily”; it means every other day.
  • It can differ slightly from ごとに (一日ごとに means every single day).

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