die Gattin
wife
A formal or elevated term for one's wife.
Der Minister erschien in Begleitung seiner Gattin zur Gala.
The minister appeared at the gala accompanied by his wife.

wife
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wife
A formal or elevated term for one's wife.
Der Minister erschien in Begleitung seiner Gattin zur Gala.
The minister appeared at the gala accompanied by his wife.

'Gattin' (wife) is a formal and elevated term. It is used in official contexts, in written language, or when one wants to sound especially polite and distant. In everyday life, the word is uncommon.
Der Präsident hielt die Rede an der Seite seiner Gattin.
The president gave the speech alongside his wife.
A very fixed expression is the phrase 'und Gattin' (and wife), which is often used on formal invitations or in official announcements to refer to a married couple.
Zur Gala werden Herr Dr. Müller und Gattin erwartet.
Dr. Müller and wife are expected at the gala.
When speaking about another person's wife, 'Gattin' (wife) can express respect. If you refer to your own wife as 'meine Gattin' (my wife), it can sound slightly old-fashioned or even ironic depending on the context.
Darf ich Ihnen meine Gattin vorstellen?
May I introduce you to my wife?
woman / wife
'die Frau' and 'die Gattin' can both mean a wife. 'Meine Frau' is the normal form in everyday language and sounds natural in conversation. 'Gattin' also means wife, but sounds formal or elevated. You are more likely to hear it at official occasions, in written texts, or in very polite language. If you are simply talking with friends, 'Frau' is much more natural. 'Gattin' fits when the tone should be especially formal.

Der Bürgermeister begrüßt den Gast und seine Gattin.
The mayor greets the guest and his wife.
Paul kommt heute mit seiner Frau zum Abendessen.
Paul is coming to dinner today with his wife.