How to Say "Crown Princess" in Japanese

皇太子妃

kōtaishihi

The English phrase "crown princess" is translated into Japanese as 皇太子妃 (kōtaishihi).

The term is used to refer to the heiress apparent to a throne in a monarchy.

Meaning: the heiress apparent to the throne in a monarchy (noun)

What does it mean word for word?

The word is composed of 皇太子 (kōtaishi), meaning 'crown prince' and 妃 (hi), meaning 'princess' or 'consort'.

While 皇太子 (kōtaishi) refers specifically to a crown prince, adding the suffix 妃 (hi) specifies the title for a female.

kōtaishihi

The title 皇太子妃 is only used for the wife of the crown prince. In the current Japanese Imperial House Law, women cannot inherit the throne, so there is no such thing as a female crown princess who is the heiress apparent.
The character 皇 in 皇太子妃 specifically denotes an 'emperor' as opposed to a 'king'. While both can be translated as 'monarch', Japanese distinguishes between the 'imperial' (皇) and 'royal' (王) nature of the throne.
The character 妃 can be read as きさき (kisaki) in certain historical or formal contexts, even though it is commonly read as ひ (hi) in the modern title 皇太子妃.

彼女は皇太子妃です。
Kanojo wa kōtaishiki desu.
She is the crown princess.
皇太子妃のニュースを見ました。
Kōtaishiki no nyūsu o mimashita.
I saw the news about the crown princess.

Misaki and Yota are discussing the royal news on TV.

美咲 Misaki

テレビに皇太子妃が出ているよ。
Terebi ni kōtaishibi ga dete iru yo.
The crown princess is on TV.
陽太 Yota

本当に美しい方だね。
Hontō ni utsukushii kata da ne.
She is truly beautiful.
美咲 Misaki

ファッションセンスも素晴らしいと思うわ。
Fasshon sensu mo subarashii to omou wa.
I think her fashion sense is wonderful too.
陽太 Yota

確かに、とても洗練されているね。
Tashika ni, totemo senren sarete iru ne.
Indeed, she is very sophisticated.

Sources

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