commensurable vs mensurable

commensurable

adj
  • Related in size or scale; commensurate or proportionate. 

  • (of two or more numbers) Divisible by the same number ᵂᴾ 

  • Able to be measured using a common standard. 

mensurable

adj
  • measurable 

  • Having a fixed rhythm. 

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