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.

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An old issue of a periodical.
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(informal) An old-fashioned person or thing.
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A back issue of a magazine, etc.
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Anything considered old-fashioned.
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Other Word Forms

Noun

Singular:
back-number
Plural:
back-numbers