Yes, right, we have probably gone off topic here, in my enthusiasm of hearing 'εντριβής' after such a long time -- though the topic itself seems to have changed even in the title.
First of all, εντριβής as it is (rarely) used today, is probably the equivalent of 'proficient', good for degrees and certificates.
The original request was the other way round. Ken was looking for a translation for 'versed'. Thanks, Marisa, for putting us back on track.