precedent vs prodromous

precedent

adj
  • Happening or taking place earlier in time; previous or preceding. 

verb
  • To provide precedents for. 

  • To be a precedent for. 

noun
  • The previous version. 

  • A decided case which is cited or used as an example to justify a judgment in a subsequent case. 

  • An established habit or custom. 

  • An act in the past which may be used as an example to help decide the outcome of similar instances in the future. 

prodromous

adj
  • precursory 

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