1) Act not to be repeated 2) Almost exact 3) Happening only a single time 4) Show with no sequel planned 5) Single-edition mag 6) Singular event 7) Singular publication 8) Unduplicated event 9) Unique event 10) Unique or remarkable event 11) Unique or remarkable person 12) Unrepeated event 
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 ...[OVA] ==Story== The story follows a young girl named Haruno Shiozaki and her friends who enjoy motorcycles and one day meet a curious motorcyclist named Cynthia. ==Characters== ==Episode list== ...
A product or part that is not designed to be mass produced. It can refer to a one-of-a-kind bolt-on or a fully customized motorcycle.
One time only
Fabrication process in which a single part is fabricated.
See One-time use of a list.
noun a happening that occurs only once and is not repeated
A one off is a special or a one time event that is never to be repeated. Like writing this book!
Those who happen to watch TV shows such as American Chopper get to observe the building of a custom