assemblage vs quaternion

assemblage

noun
  • A gathering of people. 

  • A visual art form similar to collage, which combines two-dimensional and three-dimensional, often found, elements into works of art. 

  • The process of assembling or bringing together. 

  • A collection of things which have been gathered together or assembled. 

  • A group of different artifacts found in association with one another. 

quaternion

noun
  • A group or set of four people or things. 

  • A type of four-dimensional hypercomplex number consisting of a real part and three imaginary parts (real multiples of distinct, independent square roots of −1 denoted by i, j and k); commonly used in vector mathematics and as an alternative to matrix algebra in calculating the rotation of three-dimensional objects. 

  • A word of four syllables. 

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