noun
adult woman; mature woman
Rare term for a fully grown or mature woman. Not in common use; more typical words include 成人女性 or 大人の女性.
「成女」は、成人した女性を指す古風な言い方だ。
成女 is an old-fashioned way to refer to an adult woman.
Compound of 成 (sei, 'become, mature') and 女 (jo, 'woman'). The exact historical derivation is uncertain; it appears to be a straightforward kanji compound for 'mature woman'.