Other forms: derivatives; derivatively
Alert: shifting parts of speech! As a noun, a derivative is kind of financial agreement or deal. As an adjective, though, derivative describes something that borrows heavily from something else that came before it.
In grammar and linguistics, a word that is formed from another word is called a derivative. For example, the word courageous is a derivative of the word courage. In economics, derivatives are deals based on the outcome of other deals. A movie plot might be described as derivative if it steals from another film — say, if it lifts the tornado, the witch, and the dancing scarecrow from The Wizard of Oz.