What is "backprenominal out-of-date"

noncurrent \noncurrent\ adj. not current or belonging to the present time. Opposite of current. [Narrower terms: back(prenominal), out-of-date; discontinued, out of print(predicate), out of production(predicate), out of use(predicate); disused, obsolete ; {obsolete, outdated, outmoded, out-of-date, superannuated ; {obsolescent ] Also See: {old, past.