demand vs invocation

demand

noun
  • A forceful claim for something. 

  • An urgent request. 

  • The desire to purchase goods and services. 

  • An order. 

  • The amount of a good or service that consumers are willing to buy at a particular price. 

  • A requirement. 

  • More precisely peak demand or peak load, a measure of the maximum power load of a utility's customer over a short period of time; the power load integrated over a specified time interval. 

verb
  • To require of someone. 

  • To claim a right to something. 

  • To ask forcefully for information. 

  • To request forcefully. 

  • To issue a summons to court. 

invocation

noun
  • An act of invoking or claiming a legal right. 

  • The act or form of calling for the assistance or presence of some superior being, especially prayer offered to a divine being. 

  • The act of invoking, such as a function call. 

  • A call or summons, especially a judicial call, demand, or order. 

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