
die Cousine
female cousin
The daughter of one's aunt or uncle.
Meine Cousine aus Hamburg kommt uns am Wochenende besuchen.
My cousin from Hamburg is coming to visit us this weekend.
cousin
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female cousin
The daughter of one's aunt or uncle.
Meine Cousine aus Hamburg kommt uns am Wochenende besuchen.
My cousin from Hamburg is coming to visit us this weekend.
'Cousine' (female cousin) is a loanword from French. This explains its special spelling and pronunciation, which differ from typical German.
Die Hochzeit meiner Cousine findet in Frankreich statt.
My cousin's wedding is taking place in France.
In southern Germany, Austria, and Switzerland, the word 'die Base' (female cousin) is also used for 'Cousine' (female cousin). However, 'Cousine' is understood throughout the German-speaking world.
Am Sonntag treffe ich mich mit meiner Base zum Kaffeetrinken.
On Sunday I'm meeting my cousin for coffee.
To describe the family line more precisely, you can use the additions 'mütterlicherseits' (on the mother's side) or 'väterlicherseits' (on the father's side).
Meine Cousine väterlicherseits wohnt in den USA.
My cousin on my father's side lives in the USA.
base / cousin
Both words can refer to a female relative. Base, however, is an outdated or regional term, while Cousine is the usual term in modern standard German. Use Cousine in general; Base is mainly appropriate when the regional or old-fashioned wording is important.

Im heutigen Standarddeutsch stelle ich Anna als meine Cousine vor.
In modern standard German, I introduce Anna as my cousin.
Meine Großmutter aus dem Dorf nennt Anna noch die Base, obwohl sie meine Cousine ist.
My grandmother from the village still calls Anna my base, even though she is my cousin.