au·then·tiv [aw-then-tiv]
--adjective
1. both authentic and creative.
2. an inventive expression of the author.
3. having the quality or power of creating work that is not false or copied; genuine; real: an authentive production.
4. resulting from originality of thought, expression, etc.; imaginative: authentive writing.
5. originative; productive (having the power of producing).
6. entitled to acceptance or belief despite its originality because of agreement with known facts or experience; reliable; trustworthy: an authentive story about life in London.
7. Music.
a. having a range extending from the final to the octave above.
b. consisting of a dominant harmony followed by a tonic.

[Origin: 2005; authentic + creative ]