existing at the beginning of a particular period, process or activity

new and interesting in a way that is different from anything that has existed before; able to produce new and interesting ideas

That's not a very original suggestion.

the product of a highly original mind

It's a taut, fast-moving detective story with strikingly original characters.

I don't think this is a truly original idea.

He believes that he is creating something wholly original.

painted, written, etc. by the artist rather than copied

an original painting by local artist Graham Tovey

The original manuscript has been lost.

Only original documents will be accepted as proof of status.

a document, work of art, etc. produced for the first time, from which copies are later made

a person who thinks, behaves, dresses, etc. in an unusual way

Mark Twain was a true original who possibly did more for American literature than any other writer.

LEARNit Dictionary