conjugate vs plight one’s troth

conjugate

verb
  • To multiply on the left by one element and on the right by its inverse. 

  • To inflect (a verb) for each person, in order, for one or more tenses; to list or recite its principal parts. 

  • To join together, to unite; to juxtapose. 

  • To temporarily fuse, exchanging or transferring DNA. 

adj
  • Presenting themselves simultaneously and having reciprocal properties; said of quantities, points, lines, axes, curves, etc. 

  • United in pairs; yoked together; coupled. 

  • Agreeing in derivation and radical signification; said of words. 

  • In single pairs; coupled. 

  • Containing two or more radicals supposed to act the part of a single one. 

noun
  • Given a field extension L / K and an element α ∈ L, any other element β ∈ L that is another root of the minimal polynomial of α over K. 

  • An explementary angle. 

  • A word agreeing in derivation with another word, and therefore generally resembling it in meaning. 

  • A complex conjugate. 

  • A weak and a strong antigen covalently linked together 

  • Any entity formed by joining two or more smaller entities together. 

  • More generally, any of a set of irrational or complex numbers that are zeros of the same polynomial with integral coefficients. 

plight one’s troth

How often have the words conjugate and plight one’s troth occurred in a corpus of books? (source: Google Ngram Viewer )