Grammar Info

N3 Lesson 8: 8/23

()きにRepeated at intervals, Every other, Every, At intervals of

Structure

Number + Counter + おきに

Details

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About おきに

()きに is a combination of ()き, a suffix meaning 'opening' or 'interval', and the case marking particle に. Primarily written without kanji, it is an expression used to show that something happens 'every (A)', or 'at intervals of (A)'.

The difference between something being interpreted as 'every', or 'at intervals of' can be tricky though, so we'll look at both.

Due to おきに being a suffix, it will be attached to the end of numbers, counters, or any 'space' that it is highlighting as being an 'opening' or 'interval'.

Looking at these sentences, we can see that the 'interval' is a bit difficult to understand even in English. However, the easier way to think of おきに in this sense is 'leaving a space of (A), (B)'. So if we say 'leaving a space of two days, (B)', it becomes a bit clearer that something is happening during the third day.

Caution

It is very common to get ごとに and おきに mixed up. The former literally means 'every'. However, the latter having the meaning of 'at intervals' makes things confusing. おきに itself will only mean 'every' sometimes. Let's look at some examples of when these two expressions overlap in meaning, and when they do not.

Large time frames or distances - Only ごとに will be used to express 'every'. It makes sense to ask 'at what point' during a day, a week, or a month. Due to this, only おきに will mean 'after the interval of (A)', while ごとに means 'every'.

Small time frames or distances - Both ごとに and おきに may be used to express 'every'. It doesn't make sense to care about 'at what point' during seconds, minutes, or hours. Here, because おきに points at the interval, it will mean 'every interval of one second' etc, because nobody is going to ask 'when did (B) happen during the next second', so the space is just assumed to be 'one second'.

In summary, おきに will mean 'every (A)' for seconds, minutes, hours, millimeters, centimeters, and kilometers. But it will mean 'with spaces of' for almost anything bigger than that. This is not an exception to the rule, it is just a change of focus as spaces get larger. We can just remember that おきに always has one job. It highlights that (B) occurs after or outside of (A). While ごとに highlights (B) happening within (A).

一秒(いちびょう)おきに - The space is 'one second', so if おきに points to the beginning of the next second, the space is still only 'one second'. Because おきに doesn't care about where (B) happens within that next second, we assume straight away.

五年(ごねん)おきに - The space is 'five years', so if おきに points to the beginning of the next year, the space becomes 'six years', because we are going to want to know where (B) happens within that next year. It would be strange to assume someone is waiting for New Year of the sixth year to do something instantly.

Fun Fact

This is a topic that native speakers frequently get wrong themselves, so don't worry if it takes a while to understand! If you are unsure about which one to use, think of ()きに as 'leaving intervals of (A), (B)' for most purposes. 一時間(いちじかん) tends to be the upper limit of time that most people disagree about whether the meaning is 'every hour', or 'every second hour'. This makes sense, as the time frame is short, but still sort of long, so whether someone takes it as the beginning of the hour or some point during that hour being the important information, their opinions may differ. Remember though, おきに itself only ever points to the beginning of the space after (A), it doesn't care when/where (B) happens afterward.

Examples

--:--

    30分(さんじゅっぷん)()きに休憩(きゅうけい)しよう。

    Let's take a break in intervals of 30 minutes.

    (やく)3分(さんぷん)()きに電車(でんしゃ)()ます。

    Trains come about every 3 minutes.

    1時間(いちじかん)()きに温度(おんど)(はか)ってください。

    Please check the temperature every other hour.

    50(ごじゅう)メートル()きに自動(じどう)販売(はんばい)()がある。

    There are vending machines every 50 meters.

    階段(かいだん)一段(いちだん)()きに()ばして()がる。

    He goes up the stairs skipping every second step.

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おきに – Grammar Discussion

Most Recent Replies (30 in total)

  • mrnoone

    mrnoone

    English translation:
    repeated at intervals
    every other
    every
    at intervals of

    Structure:
    Number + Counter + おきに

    Explanation:
    おきに describes interval between events.
    For continous variables like seconds, minutes, hours assuming that event is momentary Xおきに can be replaced with Xごとに meaning every X.
    For discrete variables like days, weeks, months, stairs etc Xおきに cannot be replaced with Xごとに.

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  • matt_in_mito

    matt_in_mito

    I really don’t get this one. How do we know the difference between ‘every’ and ‘every other’?

  • mrnoone

    mrnoone

    Hey

    1おきに can mean “every” or “every other(second)” by extension depending on a counter.
    It is because おきに is used to describe an interval between events.
    Rather than saying “every X”.

    If variable expresses something that is continuous like meters, minutes and hours etc 1おきに will mean "every second/ every minute/ every meter etc.

    If variable expresses something that is discrete like days, weeks and months, steps, etc
    1おきに will mean “every second day, week, month”

    ●1。。。。。●2。。。。。●3
    This expresses continuous variable, let’s say hours.
    Black dots express hours, but between them we have minutes.
    So the interval of one hour means 60 minutes. White dots express 10 minutes.
    So after an interval of 60 minutes, we have the next event at 2 o’clock.

    So you can say that the event happens every hour (at 1st o’clock, 2nd o’c...

  • matt_in_mito

    matt_in_mito

    Hi

    Thank you very much for your very detailed explanation. I understand it better now but there is just one thing that I still don’t understand - what does ‘descrete’ mean in this situation and why is a hour considered as ‘continuous’ but a day is not? Surely days, months, years, etc. are just as continuous as seconds? Or am I just being stupid?

  • mrnoone

    mrnoone

    Good point dear sir,

    Basically, we assume that there is no such a thing as half Tuesday, half of a step etc because noone really says that.

  • matt_in_mito

    matt_in_mito

    Thanks! Yes that’s 100% clear now although that different way of thinking will take a bit of getting used to. I’ll try using it as often as I can.

  • duong091

    duong091

    hi, i think i understand the usage of this construction, but what if I actually want to say "every other hour (or any continuous variable)? what construction do i use then?

  • matt_in_mito

    matt_in_mito

    Wouldn’t you say 2時間おきに in this context? Maybe?

  • mrnoone

    mrnoone

    @duong091 @matt_in_mito
    Hey and sorry for the slow answer

    I would say that the most common way would be 2時間ごとに。2時間おきに would be also correct, but it might cause some confusion sometimes.

    I hope it helps,
    Cheers!

  • CrisH

    CrisH

    This seems like that age-old “how many days until something” problem, by which I mean stuff like this:
    If today is the 12th of August and my birthday is the 14th, how far away is it?
    The problem is that if you answer with days as discrete units, which they technically aren’t, you could have one, because there’s a day between them, or two, because 1 day away is the 13th, so 2 days away is the 14th.

    What is the case for years, out of curiosity?

  • Daru

    Daru

    I think a good way to think about is that, whenever that many of whatever you’re talking about happens, whatever you’re describing happens.

    For example, 二日おきに would be the same as saying “once two days have passed”, whereas 二日ごとに is just “every two days”

    So if our week is starting on a Monday:

    • 二日おきに would refer to Wednesday as the day the thing is happening, because two days have passed.
    • On the other hand, 二日ごとに refers to Tuesday, since it’s the second day on a two-day interval basis.

    Does that make sense? @matt_in_mito @duong091

    As a side note, I also read that the meaning may vary depending on the speaker.
    So it’s always good to just ask for confirmation if you’re feeling uncertain. I’ll copy and paste the example from this reading:

    <...
  • FredKore

    FredKore

    I want to suggest a link. The pictures here were really useful to me.

  • pandashoujo

    pandashoujo

    Hello! Has the description been updated recently for this? I just reread it during a review and found lots of information I either forgot or was added in.

    There is an example which I think is a typo, but if not, perhaps someone can explain? Towards the bottom it says this:

    Continuous variables (things that are usually measured in fractions) - Either ごとに or おきに may be used. For example, seconds, minutes, and hours are usually measured by fractions, especially considering sports and racing. In this case ごとにwill mean ‘every second’, while おきに will mean ‘every opening of one second’ (disregarding all of the milliseconds, this means every second).

    • 毎日まいにち2時間じかんおきに体からだを動うごかしている - I move my body every other 2 hours, everyday.

    It says “every second” in the explanation but in the example it says “every other.”

  • Daru

    Daru

    Hey there!

    We recenlty launched in-house explanations, or Writeups as we call them, for every single N3 Grammar Point. You can read more about that here.

    That’s probably where the extra info you’re seeing!

    It’s mostly because our translations are based on nuance and meaning rather than being literal! By adding “every other” to the 2 hours, it makes it more casual which is the tone of the sentence.

    Hope that makes sense!

  • Asher

    Asher

    Thanks for the message . Every other and every second may be used the same way in English, although it could be regional as to which is more common.

    Every other week and every second week are the same.

  • CrisH

    CrisH

    I think what they were saying was that it says “every other 2 hours”, which, in English at least, means every four hours - but in a way no one would ever word it.

  • Asher

    Asher

    They are similar, but not the same. Every other 2 hours means there is a two hour break, before something starts, and then continues for the set period of time. Basically continuing in a series of two hours, with 4 hours total. Every 4 hours would mean that something restarts/repeats at the 4 hour mark, not the 2 hour mark.

    ‘Every other’ is most frequently used with single units though (every other hour, day, week), as it does become confusing with larger numbers, exactly like おきに.

  • CrisH

    CrisH

    Sorry, I was only talking about the use in English, where every other just means one is skipped. That is, in the first two hours something would happen, then in the next two hours it wouldn’t, then in the third it would happen again, and so on, resulting in an occurrence every four hours overall.

  • Eroliene

    Eroliene

    Prompt:

    I change my smartphone at about two-year intervals.

    My answer:

    だいたい2年ごとにスマホをかいかえます。

    Error text:

    2年ごとに every two years. In other words the interval is one year.


    Can someone explain this error text to me? 2年ごとに every two years is not a grammatically complete thought in English, so there’s nothing but more confusion to be had here. Further, for in other words the interval is one year, this second sentence is not anchored to anything, so it’s not clear at all what it’s referring to: the question or my answer.

    It seems like the text is insisting “intervals of x” and “every x” mean different things? Does the prompt actually mean “every three years”? I don’t want to insist that my understanding of English is correct, but why trade in such ambiguous language to explain such an equally fraught concept in Japanese? The...

  • Sfyri

    Sfyri

    I think I understand how this grammar point is used, but am confused by the description; specifically the meaning of the kanji.

    The current description:

    “ While 置きに may appear to be an adverb, it is actually a combination of 置き, a suffix meaning ‘opening’, and the case marking particle に. 置きに (often without kanji) is an expression used to show that something happens ‘every (A)’, or ‘at intervals of (A)’.
    As おきに is technically a suffix, it will be attached to the end of numbers or counters that it is highlighting as being an ‘opening’.”
    —-

    I have been looking for a dictionary to tell me that 置 means ‘opening’, but only find what I remembered, that being ‘put’ or ‘placement’.

    This would actually make some sense if we thought of this as being derived from 置く, making 置き ‘a placing’ and 置きに ‘at placings’. However, the description says ‘opening’, so I’m left wondering if I just have bad dictionaries or if the description might be in error.

    I wou...

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