derivative vs etymon

derivative

noun
  • A word that derives from another one. 

  • A financial instrument whose value depends on the valuation of an underlying asset; such as a warrant, an option etc. 

  • The value of such a derived function for a given value of its independent variable: the rate of change of a function at a point in its domain. 

  • The linear operator that maps functions to their derived functions, usually written D; the simplest differential operator. 

  • Something derived. 

  • Any of several related generalizations of the derivative: the directional derivative, partial derivative, Fréchet derivative, functional derivative, etc. 

  • A chemical derived from another. 

  • The derived function of f(x): the function giving the instantaneous rate of change of f; equivalently, the function giving the slope of the line tangent to the graph of f. Written f'(x) or (df)/(dx) in Leibniz's notation, ̇f(x) in Newton's notation (the latter used particularly when the independent variable is time). 

adj
  • Having a value that depends on an underlying asset of variable value. 

  • Lacking originality. 

  • Imitative of the work of someone else. 

  • Obtained by derivation; not radical, original, or fundamental. 

  • Referring to a work, such as a translation or adaptation, based on another work that may be subject to copyright restrictions. 

etymon

noun
  • Meaning as derived and conveyed thereby: The literal meaning of a term according to its origin, which may differ from its usual meaning when the latter relies on idiomatic conventions that are not conveyed by the term alone (that is, they must be known in other ways, such as experience, training, education, or dictionary lookup). 

  • The original or earlier form of an inherited or borrowed word, affix, or morpheme either from an earlier period in a language's development, from an ancestral language, or from a foreign language. 

How often have the words derivative and etymon occurred in a corpus of books? (source: Google Ngram Viewer )