equation vs precept

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. 

precept

noun
  • A rule or principle, especially one governing personal conduct. 

  • An order issued by one local authority to another specifying the rate of tax to be charged on its behalf. 

  • A written command, especially a demand for payment. 

  • A rate or tax set by a precept. 

verb
  • To act as a preceptor; to teach a physician-in-training by supervising their clinical practice. 

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