What does the word maven mean in Yiddish?

The word "maven" in Yiddish actually comes from the Hebrew word "mavin" (מָבִין), which means "one who understands" or "expert". It's often used to describe someone who is knowledgeable and experienced in a particular field.

So, while "maven" is a Yiddish word, its root is Hebrew. It's a term that has become quite common in English as well, especially when referring to someone who is a connoisseur or expert.