
sich vermählen
to marry
An elevated or old-fashioned term for getting married; to enter into marriage with each other.
Das Paar wird sich im Frühling auf einem alten Schloss vermählen.
The couple will marry in the spring at an old castle.
to marry / to unite
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to marry
An elevated or old-fashioned term for getting married; to enter into marriage with each other.
Das Paar wird sich im Frühling auf einem alten Schloss vermählen.
The couple will marry in the spring at an old castle.

to unite
Used figuratively for the harmonious joining or blending of two different things, often in an artistic or culinary context.
In diesem Gericht vermählen sich traditionelle Rezepte mit modernen Einflüssen.
In this dish, traditional recipes unite with modern influences.
'Vermählen' (to marry) belongs to the same word family as 'der Gemahl' (husband) and 'die Gemahlin' (wife). These words share an old root and all belong to an elevated, formal style of language.
Der Prinz und seine Gemahlin werden das Land regieren.
The prince and his wife will rule the country.
You can recognize the meaning of the word from the subject: if it refers to people, it means 'heiraten' (to marry). If it refers to things or concepts (e.g., aromas, styles, ideas), it means 'harmonisch verbinden' (to unite harmoniously).
Das königliche Paar wird sich im Sommer vermählen.
The royal couple will marry in the summer.
In the meaning 'heiraten' (to marry), 'sich vermählen' (to get married) is very formal, poetic, or even old-fashioned. In normal usage, 'heiraten' is almost always used.
In alten Romanen liest man oft, dass die Liebenden sich am Ende vermählen.
In old novels, you often read that the lovers marry at the end.
When referring to getting married, the verb is always used reflexively: 'sich vermählen' (to get married). It is often followed by the preposition 'mit' (with) to name the partner.
Sie hat sich mit ihrer Jugendliebe vermählt.
She married her childhood sweetheart.
to marry / to marry off
„Verheiraten“ normally means that someone marries another person to someone else or arranges the marriage for them. „Sich vermählen“, by contrast, describes the two people getting married themselves and sounds elevated or old-fashioned. Use „verheiraten“ for the person arranging the marriage and „sich vermählen“ for the couple.

Die Tochter und der Mann vermählten sich im folgenden Frühjahr.
The daughter and the man married the following spring.
Die Eltern verheirateten ihre Tochter mit einem Mann aus dem Nachbardorf.
The parents married their daughter off to a man from the neighboring village.