noun
1. : an issue (as of a magazine) preceding the current one
2. : something that is out of date
the building has become a back number in construction and design — Lee Graham
noun
1. : an issue (as of a magazine) preceding the current one
2. : something that is out of date
the building has become a back number in construction and design — Lee Graham
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012