consideration vs courtesy

consideration

noun
  • A matter of inducement for something promised; something valuable given as recompense for a promise, which causes the promise to become binding as a contract. 

  • Importance, claim to notice, regard. 

  • Something considered as a reason or ground for a (possible) decision. 

  • The tendency to consider others. 

  • The thought process of considering, of taking multiple or specified factors into account (with of being the main corresponding adposition). 

  • A payment or other recompense for something done. 

courtesy

noun
  • Willingness or generosity in providing something needed. 

  • A curtsey. 

  • The life interest that the surviving husband has in the real or heritable estate of his wife. 

  • A polite gesture or remark, especially as opposed to an obligation or standard practice. 

  • Consent or agreement in spite of fact; indulgence. 

  • Polite behavior. 

adj
  • Supplied free of charge. 

  • Given or done as a polite gesture. 

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