Today I saw some advertisement on television, which promoted “Zitronenlimonade”.
If Limonade is drink made of lemon, what does Zitronenlimonade mean?
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The term has broadened its meaning to refer to all types of (carbonated) sweet drinks, often lemon / lime / orange flavoured, but not necessarily so.
Explicitly stating the "Zitronen-" in Zitronenlimonade seems to be a pleonasm, but actually clarifies the meaning. Also note that in English "lemonade" and "lemon" have the same stem, which "Zitrone" doesn't.