User A asks for a definition of term X. User B provides a definition, the answer is clear and seems complete. I also wondered what is X. Can I upvote the answer of user B, even if have no way of verifying it is correct?
There is a similar question on Meta, but it considers accepting an answer. One of the advises is votes from the community will fill the gap between which answer is most correct. So it seems that upvoting is treated as an opinion from an expert who can verify that the answer is correct. Is this true?