a priori vs illegitimate

a priori

adj
  • Presumed without analysis. 

  • Self-evident, intuitively obvious. 

  • Based on hypothesis and theory rather than experiment or empirical evidence. 

  • Developed entirely from scratch, without deriving it from existing languages. 

adv
  • In a way based on theoretical deduction rather than empirical observation. 

illegitimate

adj
  • Not correctly deduced. 

  • Not sanctioned by marriage. 

  • Not authorized by good usage; not genuine. 

  • Involving the fertilization of pistils by stamens not of their own length, in heterogonously dimorphic and trimorphic flowers. 

  • Not conforming to known principles, or established or accepted rules or standards. 

  • Born to unmarried parents. 

  • Not in accordance with the law. 

noun
  • A person born to unmarried parents. 

verb
  • To make illegitimate. 

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