one-off

Chiefly British.
adjective
1.
done, occurring, or made only once; one-shot.
noun
2.
something occurring, done, or made only once.

Origin:
1935–40

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
one-off
 
n
(Brit) Also: one-shot
 a.  something that is carried out or made only once
 b.  (as modifier): a one-off job
 
[See off (sense 15)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

one-off
"single example of a manufactured product," 1934, from one + off. Later given figurative extension.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Particularly given how many questions executives were asked about serialized
  versus one-off storytelling.
But that success is a one-off, and the big contributors are still contributing
  big, with all that entails.
Unfortunately, the conversion was a one-off vehicle.
We have so many one-off designers that have these little cottage industries.
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