courtesy vs offertory

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. 

offertory

noun
  • The part of the Eucharist service when offerings of bread and wine are placed on the altar and when any collection is taken; also, the money or other things collected. 

  • A linen or silken cloth anciently used in various ceremonies connected with the administration of the Eucharist. 

  • A prayer said or sung as an anthem while offerings of bread and wine are placed on the altar during the Roman Catholic Mass or the Anglican Communion service. 

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