derivation vs outfall

derivation

noun
  • A leading or drawing off of water from a stream or source. 

  • The act of tracing origin or descent. 

  • The act of receiving anything from a source; the act of procuring an effect from a cause, means, or condition, as profits from capital, conclusions or opinions from evidence. 

  • That from which a thing is derived. 

  • That which is derived; a derivative; a deduction. 

  • The state or method of being derived; the relation of origin when established or asserted. 

  • Forming a new word by changing the base of another word or by adding affixes to it. 

  • The operation of deducing one function from another according to a fixed definition, referred to as derivation or differentiation; this is the inverse operation to integration. 

  • A drawing of humors or fluids from one part of the body to another, to relieve or lessen a morbid process. 

outfall

noun
  • The point or place of discharge of a river, drain, culvert, sewer, etc.; mouth; embouchure. 

  • A quarrel; a falling out. 

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