gradation vs metre

gradation

noun
  • A diatonic succession of chords. 

  • A calibration marking. 

  • A passing by small degrees from one tone or shade, as of color, to another. 

  • Apophony. 

  • A gradual change within one parameter, or an overlapping of two blocks of sound. 

  • A sequence of gradual, successive stages; a systematic progression. 

  • Any degree or relative position in an order or series. 

  • The act of gradating or arranging in grades. 

verb
  • To form with gradations. 

metre

noun
  • The rhythm or measure in verse and musical composition. 

  • The basic unit of length in the International System of Units (SI: Système International d'Unités), equal to the distance travelled by light in a vacuum in 1/299 792 458 seconds. The metre is equal to 39+⁴⁷⁄₁₂₇ (approximately 39.37) imperial inches. 

verb
  • To put into metrical form. 

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