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(young) girl; maiden; young lady
「少女」 has another reading with different meanings.
その少女は可愛らしい服を着ていた。
The girl was wearing cute clothes.
少女漫画が好きで読んでいるよ。
I like and read shojo manga.
あの少女は将来有望だと思うな。
I think that girl has a promising future.