Crown Princess
Crown Princess Consort
noun
Remember how 皇太子 is "crown prince"? Well, when a crown prince gets married his royal consort is the crown princess.
皇太子妃 specifically refers to the wife of the Crown Prince, rather than a woman who is the heir to the throne herself. Technically speaking, she is a crown princess consort.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
皇太子妃がいる
the Crown Princess is present, there is a Crown Princess
皇太子妃がする
the Crown Princess does
皇太子妃が来る
the Crown Princess comes
皇太子妃になる
to become Crown Princess
皇太子妃にする
to make someone Crown Princess
皇太子妃に迎える
to take someone as one's Crown Princess
皇太子妃が軍に志願するはずねぇだろうが。
There ain't no way the Crown Princess would volunteer for the army.
皇太子妃の言葉は、争いを収める不思議な力を持っていた。
The Crown Princess's words had the mysterious power to end quarrels.
皇太子妃は新しい国の風習を学ぶため、毎夜遅くまで書を読んだ。
The Crown Princess read books until late each night to learn the customs of the new land.
皇太子妃は遠征に出る皇太子の背を、言葉なく見送った。
The Crown Princess wordlessly saw the Crown Prince off as he left on campaign.
皇太子妃が最後に残した言葉は、今も宮廷の謎として語られている。
The Crown Princess' final words are still spoken of as a palace mystery.