For exemple is it possible to write 部分々数 in place of 部分分数 or is it considered bad practice?

I am asking this primarily because it is convenient for taking notes. But I would want to know if it is possible to use in every document or if it should be reserved for personal use.


From what I understand, it's not to be used across words as you mentioned.

  • [会社社長]{かい・しゃ・しゃ・ちょう} → The president of a company
  • [民主主義]{みん・しゅ・しゅ・ぎ} → Democracy
  • [市神神社]{いち・がみ・じん・じゃ} → Ichigami Shrine

From Wikipedia:


  • Thank you for your answer. I'll accept this one because it mentions exceptions to the rule that macraf's answer does not address but macraf's answer is good too and I regret that only one answer can be accepted. – 永劫回帰 Nov 17 '15 at 4:11

It is definitely a bad style.

Wikipedia article first states:

Using 々 instead of repeating kanji is usually the preferred form, with two restrictions: (...) the repetition must be within a single word.

Then admits in longer compound words it is sometimes used:

the abbreviated 民主々義 is only occasionally seen

Nevertheless you can see dōnojiten used with disregard for all rules:


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