differentiate vs variate

differentiate

verb
  • To make different; to change, modify. 

  • To (cause to) go through a process of development called differentiation; to make or become different in form or function. 

  • To recognize a distinction or difference between two things. 

  • To perceive the difference between things; to discriminate. 

  • To calculate the derivative of a function. 

  • To calculate the differential of a function of multiple variables. 

  • To teach a lesson in multiple different ways in order to meet the needs of more or less advanced students. 

noun
  • Something that has been differentiated or stratified. 

variate

verb
  • To alter; to vary; to make or become different. 

noun
  • The measured magnitude of a variable. 

  • random variable 

  • A variable, often the set of x values plotted on a graph. 

  • A measurable quantity capable of taking on a number of values. 

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