noun
young woman; adult woman
Colloquial term often used in lifestyle media and marketing to refer to women in their 20s to 30s who are mature yet youthful, with a focus on fashion, beauty, and lifestyle.
オトナ女子に人気のカフェがオープンした。
A café popular with young adult women has opened.
この雑誌はオトナ女子向けのファッションを紹介している。
This magazine introduces fashion for young adult women.
A modern compound of オトナ (adult) and 女子 (girl/woman), popularized in Japanese lifestyle media and marketing from the 2010s onward.