Jisho

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いっせいちだい 一世一代
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Noun, Noun which may take the genitive case particle 'no'
1. once in a lifetime; the first and last occurrence (event, experience) of one's lifetime​Yojijukugo (four character compound)
Other forms
一世一代 【いっせいいちだい】
Notes
いっせいいちだい: Irregular kana usage.

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