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A one-off is something made or occurring only once, independent of any pattern. First used in 1934, this term is employed to differentiate singular items from those in a series: e.g. "the Lincoln Futura was a one-off". It has been suggested that it is a misspelling of "one-of", but this etymology is not supported by sources such as the Oxford English Dictionary.
- BBC: Britishisms and the Britishisation of American English, 27 September 2012
- New York Times: The Origins of ‘One-Off’, 2 July 2010
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