catena vs concatenation

catena

noun
  • A series of related items. 

  • A series of distinct soils arrayed along a slope. 

concatenation

noun
  • A series of links united; a series or order of things depending on each other, as if linked together; a chain, a succession. 

  • The application of these series of links. 

  • The operation of joining multiple character strings. 

  • A character string formed by joining multiple character strings. 

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