adjacent vs in the background

adjacent

prep
  • Next to; beside. 

  • Related to; suggestive of; bordering on. 

adj
  • Lying next to, close, or contiguous; neighboring; bordering on. 

  • Related to; suggestive of; bordering on. 

  • Just before, after, or facing. 

noun
  • Something that lies next to something else, especially the side of a right triangle that is neither the hypotenuse nor the opposite. 

in the background

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