Definitions for back number
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Random House Webster's College Dictionary
back′ num′ber(n.)
an out-of-date issue of a serial publication.
Informal. anything out-of-date.
Category: Informal
Origin of back number:
1805–15, Amer.
Wiktionary
back number(Noun)
A back issue of a magazine, etc.
back number(Noun)
Anything considered old-fashioned.
Citation
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"back number." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/back number>.