How to say "What does _____ mean?"
Say, in conversation, you don't understand a particular word used, how do you say "what does 'that word' mean?"

Question

Answer

"What does ___ mean?" (Answers below are from most formal to least)
１．＿＿というのはどういう意味ですか。
２．＿＿っていうのはどういう意味ですか。
３．＿＿って何？

Another useful phrase: "How do you say ___ in English?" (If you want a translation rather than an explanation)
英語で＿＿は何に当たりますか。
(The literal translation is "what does ___ correspond to in English". The literal Japanese phrase for 'how do you say___ in English' in Japanese is very unnatural)

Answer

I would say..

.... はどういう意味ですか
.... wa dōiu imi desu ka

But it might be better to wait for an answer of a native.

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