To read means you are actively reading, or you have in the past read something.
Note that to be actively reading and have that be read, does not mean that read does not also mean to have already read something.
I tend to trust Oxford above just about any dictionary, and they are the most reputable by the way. There are several definitions, a concentration camp can be a place where troops are held before they go out... that fell out of use around the 60s-70s though according to Oxford while the definition I noted has been in use from 1895 to modern times.