juxtaposition vs simultaneity

juxtaposition

noun
  • Two or more contrasting sounds, colours, styles etc. placed together for stylistic effect. 

  • The nearness of objects with little or no delimiter. 

  • An absence of linking elements in a group of words that are listed together. 

  • An absence of operators in an expression. 

  • The close placement of two ideas to imply a link that may not exist. 

  • The extra emphasis given to a comparison when the contrasted objects are close together. 

verb
  • To place in juxtaposition. 

simultaneity

noun
  • More than one complete musical texture occurring at the same time. This first appeared in the music of Charles Ives, and is common in the music of Conlon Nancarrow, and others. 

  • The quality or state of being simultaneous; simultaneousness. 

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