5 Nov
2001
5 Nov
'01
3:24 a.m.
The American Heritage Dictionary of the English Language lists "One-off" as:
Adjective: (Chiefly British) Happening, done, or made only once.
Noun: Something that is not repeated or reproduced.
Does anyone have an Oxford English Dictionary handy? It should give the date
of the earliest in-print reference.