decoding vs elucidation

decoding

noun
  • An instance of the translation of something into a form more suitable for subsequent processing. 

elucidation

noun
  • A making clear; the act of elucidating or that which elucidates, as an explanation, an exposition, an illustration 

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