
die Ehefrau
wife
A woman who is married; the female partner in a marriage.
Er hat seine Ehefrau im Urlaub kennengelernt.
He met his wife on vacation.
wife
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wife
A woman who is married; the female partner in a marriage.
Er hat seine Ehefrau im Urlaub kennengelernt.
He met his wife on vacation.
The word is clearly composed of 'die Ehe' (marriage) and 'die Frau' (woman). So it literally means 'marriage-woman'.
Sie ist seit zwanzig Jahren seine Ehefrau.
She has been his wife for twenty years.
The term 'Ehefrau' (wife) is often used in a formal, official, or legal context. You find it, for example, on official forms, in contracts, or in newspaper reports.
Auf dem Formular müssen Sie den Namen Ihrer Ehefrau eintragen.
On the form, you must enter your wife's name.
Since the word describes a relationship, it is almost always used with a possessive article (meine, seine, ihre ...) or a genitive ('die Ehefrau des Präsidenten' — the president's wife). This makes clear whom the person belongs to or is connected with.
Meine Ehefrau ist Ärztin von Beruf.
My wife is a doctor by profession.
woman / wife
Frau can generally mean an adult female person, but with a possessive word such as meine Frau it can also refer to one’s spouse. Ehefrau explicitly names this relationship and is therefore unambiguous. Use Frau in a familiar marital context, and Ehefrau when the information should be clear without any further context.

Seine Ehefrau wartet heute nach der Arbeit vor dem Kino auf ihn.
His wife is waiting for him in front of the cinema after work today.
Meine Frau wartet heute nach der Arbeit vor dem Kino auf mich.
My wife is waiting for me in front of the cinema after work today.