How to say "separately" in Japanese

• いちいちJLPT N2approx.Common
  noun, adverbCovers 'separately' as in taking each item individually, one at a time — mentioning, checking, or responding to every single one. Usually written in kana alone.
  ジョンが品物しなものをいちいち手てに取とって見みた。↗

  John picked up the articles one by one and examined them.
• 一つ一つひとつひとつCommon
  adverb, no-adjectiveUsed for taking things one at a time — handling objects, working through tasks, or explaining points — and it also covers the sense 'in detail', going through something thoroughly.
  １つ１つの出願しゅつがんを１件けんずつ考慮こうりょしなければならないだろう。↗

  We will have to consider each application on a case-by-case basis.
• 口々にくちぐちにCommon
  adverbReally about speech rather than separation: a number of people each voicing something, one and all or in unison. For most senses of 'separately' this is not the word you want.
  その不当ふとうな扱あつかいを口々くちぐちに訴うったえた。↗

  Everyone complained about the unfair treatment.
• 別途べっとCommon
  noun, adverbThe word for something handled separately from what has been arranged or discussed, typical of business and official contexts — a matter dealt with on its own rather than as part of the main arrangement.
• 別にべつにJLPT N3approx.Common
  adverbCovers keeping things apart or doing something separately from the rest, and also 'additionally; extra' — something provided or done apart from, and on top of, the main matter.
  ソースを別べつにください。↗

  I'd like the sauce on the side.

Choose 「いちいち」 or 「一つ一つ」 for dealing with items one at a time, 別途 for matters handled separately from the main arrangement, 「別に」 for keeping or doing things apart or in addition, and 「口々に」 only for people each speaking.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• いちいちone-by-one
• 一つ一つひとつひとつone-by-one
• 口々にくちぐちにeach and every person (saying)
• 別々にべつべつにseparately
• 単独でたんどくでindependently
• 個々にここにindividually
• てんでにeach
• 別途べっとseparately
• 別にべつにseparately