Original and One-off

Original noun - Something from which copies are made.

One-off and original are semantically related. (British) In some cases you can use "One-off" instead a noun "Original". informal substitute

Nearby Words: origin, originality, origination, originator, originally

One-off noun - A happening that occurs only once and is not repeated.

Original and one-off are semantically related. Sometimes you can replace term "Original" with "One-off", this terms are similar.