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1)
#361
Common N4
いちど
いちど
いちど
Meaning
    1. ①
      once; one time; on one occasion
      A habit is very difficult to shake off once it is formed.
    2. ②
      temporarily; for a moment
      Only applies to ひとたび
    3. ③
      one degree; one tone; one musical interval
      Only applies to いちど
      Distance per degree of longitude at equator.
Forms
2)
#1,549
Common
かつて
Meaning
    1. ①
      once; before; formerly; ever; former; ex-
      The Japanese at large consider themselves better off than they used to be.
    2. ②
      never yet; never before; first time; still not happened
      used with neg. verb
Forms
4)
#2,989
Common
いったん
Meaning
    1. ①
      once
      What is done cannot be undone.
    2. ②
      for a short time; briefly; temporarily
      Having once landed the monster immediately jumped again and was over my head.
    3. ③
      one morning
Forms
5)
#8,103
Common
いっぺん
いっぺん
Meaning
    1. ①
      once; one time
      I've never been to Hokkaido.
    2. ②
      exclusively; only; alone
      after a noun
    1. ①
      EN Ippen Shōnin (一遍上人 1234–1289, also known as Zuien) was a Japanese Buddhist itinerant preacher (hijiri) who founded the Ji-shū (時宗 time sect) branch of Pure L...
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Forms
7)
#5,977
あるとき
Meaning
    1. on one occasion; once; at one point; at one time
Forms
8)
#137,083
いつぞや
Meaning
    1. some time ago; the other day; at some time or other; once
Forms
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