"What does "a lecture" mean?"
Translation:Vad betyder "en föreläsning"?
betyder is 'to have a certain meaning'. Like, this word means that. Also used in 'he means a lot to me'-contexts.
menar is like 'refers to', 'has in mind'. Like in Vad menar du? 'What do you mean?'
This should've been marked as a typo.
PS. I'm aware that you shouldn't report mistakes in the comment section, but some guy in another comment section said that one should post a picture if this happens as proof. Please tell me, if they were wrong. I'll delete this comment.
We get loads of error reports for this sentence - rightly so, because Duolingo unfortunately keeps screwing people's quotation marks up. For this reason, we'll be removing it from the next version, but for now, I'm afraid we'll have to live with some inconsistent marking in this lesson.