Kanji 再 again, twice, second time Related words よく よく is the most common word for 'often' and is neutral in tone. 再々 is more emphatic and implies a higher frequency or a sense of 'over and over'.
たびたび たびたび also means 'often' or 'frequently', but 再々 can sound slightly more formal or emphatic, and is often used in written language.
Written forms 再さい 々さい Usage 90%
Standard kanji spelling; the repetition mark 々 makes it clear and compact.
さいさい Usage 7%
Kana spelling is sometimes used for clarity or in informal writing.
再さい 再さい Usage 3%
Less common variant without the repetition mark; still encountered.
Etymology Reduplication of 再 (さい , 'again'), emphasizing repetition. The form 再々 is a straightforward doubling of the kanji.
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