equation vs fraction

equation

noun
  • 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. 

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

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

fraction

noun
  • A ratio of two numbers (numerator and denominator), usually written one above the other and separated by a horizontal bar called the vinculum or, alternately, in sequence on the same line and separated by a solidus (diagonal bar). 

  • A component of a mixture, separated by fractionation. 

  • A part of a whole, especially a comparatively small part. 

  • A small amount. 

  • In a eucharistic service, the breaking of the host. 

verb
  • To divide or break into fractions. 

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