1. adjective [dɪˈɹɪvətɪv/
a) Imitative of the work of someone else.
b) Referring to a work, such as a translation or adaptation, based on another work that may be subject to copyright restrictions.
2. noun [dɪˈɹɪvətɪv/
a) Something derived.
The derivative of is
b) A word that derives from another one.
The derivative of at x = 3 is .
Wikipedia foundation.