Back-number definition
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.
noun
An old issue of a periodical.
noun
(informal) An old-fashioned person or thing.
noun
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Other Word Forms
Noun
Singular:
back-number
Plural:
back-numbers