初出

しょしゅつ
first appearance

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しょしゅつ【初出】

the first appearance 《of…》.

●固有名詞の初出時には, それをゴシック体にしてください. When you mention a proper noun for the first time, please put it in bold type.

初出年 【言】 the year in which 《a word》 appears for the first time.

●この単語の文献初出年 the year in which this word appears for the first time in a written work.