Its motto is "Lux et veritas"
I believe the answer is:
yale
'its motto is lux et veritas' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for yale that I've seen before include "US Ivy League college" , "security device" , "University in USA" , "American university or kind of lock" , "Mass. university" .)