My Chambers 20th Century dictionary, 1981 edition, defines "believe" as "regard as true; accept as true what is said by...", without any requirement for that regarding or acceptance to be blind. So that doesn't get us very far. the term does seem to have been hijacked by the faith community to mean blind faith, which is why they frequently claim that science is "just another system of belief". This of course is a neat way of refusing to talk about the reasons for believing one thing rather than another.

If you want a rather hilarious example of where this weasel way with words leads you, read this tosh.