- The definition of a back number is an old issue of a newspaper or magazine, or something or someone who is old fashioned.
An example of a back number is a copy of a magazine from 1960.
back number definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- an old issue of a periodical
- Informal an old-fashioned person or thing
back number - Phrases/Idioms
Dated, out of style. For example, That hat is really a back number, or The game has changed so fast that a player who returns to the circuit after several years' absence usually finds he or she is a back number. This term originally referred to back issues of periodicals, which are no longer newsworthy. [Late 1800s]