equation vs ritual

equation

noun
  • The act or process of equating two or more things, or the state of those things being equal (that is, identical). 

  • An assertion that two expressions are equal, expressed by writing the two expressions separated by an equal sign; from which one is to determine a particular quantity. 

  • A small correction to observed values to remove the effects of systematic errors in an observation. 

ritual

noun
  • A rite; a repeated set of actions. 

adj
  • Related to a rite or repeated set of actions. 

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